diff --git a/java/src/com/android/inputmethod/latin/BinaryDictionary.java b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
index d1bf6d9..d181bf6 100644
--- a/java/src/com/android/inputmethod/latin/BinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/BinaryDictionary.java
@@ -38,7 +38,7 @@
     private static final String TAG = BinaryDictionary.class.getSimpleName();
 
     // Must be equal to MAX_WORD_LENGTH in native/jni/src/defines.h
-    private static final int MAX_WORD_LENGTH = Constants.Dictionary.MAX_WORD_LENGTH;
+    private static final int MAX_WORD_LENGTH = Constants.DICTIONARY_MAX_WORD_LENGTH;
     // Must be equal to MAX_RESULTS in native/jni/src/defines.h
     private static final int MAX_RESULTS = 18;
 
diff --git a/java/src/com/android/inputmethod/latin/Constants.java b/java/src/com/android/inputmethod/latin/Constants.java
index ad09b6a..6d67bdb 100644
--- a/java/src/com/android/inputmethod/latin/Constants.java
+++ b/java/src/com/android/inputmethod/latin/Constants.java
@@ -126,15 +126,6 @@
         }
     }
 
-    public static final class Dictionary {
-        // Must be equal to MAX_WORD_LENGTH in native/jni/src/defines.h
-        public static final int MAX_WORD_LENGTH = 48;
-
-        private Dictionary() {
-             // This utility class is no publicly instantiable.
-        }
-    }
-
     public static final int NOT_A_CODE = -1;
 
     public static final int NOT_A_COORDINATE = -1;
@@ -142,6 +133,10 @@
     public static final int SPELL_CHECKER_COORDINATE = -3;
     public static final int EXTERNAL_KEYBOARD_COORDINATE = -4;
 
+
+    // Must be equal to MAX_WORD_LENGTH in native/jni/src/defines.h
+    public static final int DICTIONARY_MAX_WORD_LENGTH = 48;
+
     public static boolean isValidCoordinate(final int coordinate) {
         // Detect {@link NOT_A_COORDINATE}, {@link SUGGESTION_STRIP_COORDINATE},
         // and {@link SPELL_CHECKER_COORDINATE}.
diff --git a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
index 657fc64..3f11391 100644
--- a/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/ExpandableBinaryDictionary.java
@@ -48,7 +48,7 @@
     /**
      * The maximum length of a word in this dictionary.
      */
-    protected static final int MAX_WORD_LENGTH = Constants.Dictionary.MAX_WORD_LENGTH;
+    protected static final int MAX_WORD_LENGTH = Constants.DICTIONARY_MAX_WORD_LENGTH;
 
     /**
      * A static map of locks, each of which controls access to a single binary dictionary file. They
diff --git a/java/src/com/android/inputmethod/latin/ExpandableDictionary.java b/java/src/com/android/inputmethod/latin/ExpandableDictionary.java
index 2666573..bd2d703 100644
--- a/java/src/com/android/inputmethod/latin/ExpandableDictionary.java
+++ b/java/src/com/android/inputmethod/latin/ExpandableDictionary.java
@@ -43,7 +43,7 @@
     protected static final int BIGRAM_MAX_FREQUENCY = 255;
 
     private Context mContext;
-    private char[] mWordBuilder = new char[Constants.Dictionary.MAX_WORD_LENGTH];
+    private char[] mWordBuilder = new char[Constants.DICTIONARY_MAX_WORD_LENGTH];
     private int mMaxDepth;
     private int mInputLength;
 
@@ -87,7 +87,7 @@
         }
     }
 
-    protected interface NextWord {
+    public interface NextWord {
         public Node getWordNode();
         public int getFrequency();
         public ForgettingCurveParams getFcParams();
@@ -161,7 +161,7 @@
         super(dictType);
         mContext = context;
         clearDictionary();
-        mCodes = new int[Constants.Dictionary.MAX_WORD_LENGTH][];
+        mCodes = new int[Constants.DICTIONARY_MAX_WORD_LENGTH][];
     }
 
     public void loadDictionary() {
@@ -198,11 +198,11 @@
     }
 
     public int getMaxWordLength() {
-        return Constants.Dictionary.MAX_WORD_LENGTH;
+        return Constants.DICTIONARY_MAX_WORD_LENGTH;
     }
 
     public void addWord(final String word, final String shortcutTarget, final int frequency) {
-        if (word.length() >= Constants.Dictionary.MAX_WORD_LENGTH) {
+        if (word.length() >= Constants.DICTIONARY_MAX_WORD_LENGTH) {
             return;
         }
         addWordRec(mRoots, word, 0, shortcutTarget, frequency, null);
@@ -258,7 +258,7 @@
             final boolean blockOffensiveWords) {
         if (reloadDictionaryIfRequired()) return null;
         if (composer.size() > 1) {
-            if (composer.size() >= Constants.Dictionary.MAX_WORD_LENGTH) {
+            if (composer.size() >= Constants.DICTIONARY_MAX_WORD_LENGTH) {
                 return null;
             }
             final ArrayList<SuggestedWordInfo> suggestions =
@@ -629,7 +629,7 @@
     }
 
     // Local to reverseLookUp, but do not allocate each time.
-    private final char[] mLookedUpString = new char[Constants.Dictionary.MAX_WORD_LENGTH];
+    private final char[] mLookedUpString = new char[Constants.DICTIONARY_MAX_WORD_LENGTH];
 
     /**
      * reverseLookUp retrieves the full word given a list of terminal nodes and adds those words
@@ -644,7 +644,7 @@
         for (NextWord nextWord : terminalNodes) {
             node = nextWord.getWordNode();
             freq = nextWord.getFrequency();
-            int index = Constants.Dictionary.MAX_WORD_LENGTH;
+            int index = Constants.DICTIONARY_MAX_WORD_LENGTH;
             do {
                 --index;
                 mLookedUpString[index] = node.mCode;
@@ -656,7 +656,7 @@
             // to ignore the word in this case.
             if (freq >= 0 && node == null) {
                 suggestions.add(new SuggestedWordInfo(new String(mLookedUpString, index,
-                        Constants.Dictionary.MAX_WORD_LENGTH - index),
+                        Constants.DICTIONARY_MAX_WORD_LENGTH - index),
                         freq, SuggestedWordInfo.KIND_CORRECTION, mDictType));
             }
         }
diff --git a/java/src/com/android/inputmethod/latin/LastComposedWord.java b/java/src/com/android/inputmethod/latin/LastComposedWord.java
index cdeadc7..642b3a4 100644
--- a/java/src/com/android/inputmethod/latin/LastComposedWord.java
+++ b/java/src/com/android/inputmethod/latin/LastComposedWord.java
@@ -49,7 +49,7 @@
     public final String mPrevWord;
     public final int mCapitalizedMode;
     public final InputPointers mInputPointers =
-            new InputPointers(Constants.Dictionary.MAX_WORD_LENGTH);
+            new InputPointers(Constants.DICTIONARY_MAX_WORD_LENGTH);
 
     private boolean mActive;
 
diff --git a/java/src/com/android/inputmethod/latin/LatinIME.java b/java/src/com/android/inputmethod/latin/LatinIME.java
index 6384ef7..fe5fedd 100644
--- a/java/src/com/android/inputmethod/latin/LatinIME.java
+++ b/java/src/com/android/inputmethod/latin/LatinIME.java
@@ -75,6 +75,7 @@
 import com.android.inputmethod.keyboard.MainKeyboardView;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 import com.android.inputmethod.latin.define.ProductionFlag;
+import com.android.inputmethod.latin.personalization.UserHistoryDictionary;
 import com.android.inputmethod.latin.settings.Settings;
 import com.android.inputmethod.latin.settings.SettingsActivity;
 import com.android.inputmethod.latin.settings.SettingsValues;
diff --git a/java/src/com/android/inputmethod/latin/RichInputConnection.java b/java/src/com/android/inputmethod/latin/RichInputConnection.java
index 8264f6a..2c65e5e 100644
--- a/java/src/com/android/inputmethod/latin/RichInputConnection.java
+++ b/java/src/com/android/inputmethod/latin/RichInputConnection.java
@@ -51,7 +51,7 @@
     private static final boolean DEBUG_PREVIOUS_TEXT = false;
     private static final boolean DEBUG_BATCH_NESTING = false;
     // Provision for a long word pair and a separator
-    private static final int LOOKBACK_CHARACTER_NUM = Constants.Dictionary.MAX_WORD_LENGTH * 2 + 1;
+    private static final int LOOKBACK_CHARACTER_NUM = Constants.DICTIONARY_MAX_WORD_LENGTH * 2 + 1;
     private static final Pattern spaceRegex = Pattern.compile("\\s+");
     private static final int INVALID_CURSOR_POSITION = -1;
 
diff --git a/java/src/com/android/inputmethod/latin/Suggest.java b/java/src/com/android/inputmethod/latin/Suggest.java
index ac497ec..647c6f6 100644
--- a/java/src/com/android/inputmethod/latin/Suggest.java
+++ b/java/src/com/android/inputmethod/latin/Suggest.java
@@ -22,6 +22,7 @@
 import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.keyboard.ProximityInfo;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
+import com.android.inputmethod.latin.personalization.UserHistoryDictionary;
 import com.android.inputmethod.latin.utils.AutoCorrectionUtils;
 import com.android.inputmethod.latin.utils.BoundedTreeSet;
 import com.android.inputmethod.latin.utils.CollectionUtils;
diff --git a/java/src/com/android/inputmethod/latin/WordComposer.java b/java/src/com/android/inputmethod/latin/WordComposer.java
index 0c73d44..a09ca60 100644
--- a/java/src/com/android/inputmethod/latin/WordComposer.java
+++ b/java/src/com/android/inputmethod/latin/WordComposer.java
@@ -26,7 +26,7 @@
  * A place to store the currently composing word with information such as adjacent key codes as well
  */
 public final class WordComposer {
-    private static final int MAX_WORD_LENGTH = Constants.Dictionary.MAX_WORD_LENGTH;
+    private static final int MAX_WORD_LENGTH = Constants.DICTIONARY_MAX_WORD_LENGTH;
     private static final boolean DBG = LatinImeLogger.sDBG;
 
     public static final int CAPS_MODE_OFF = 0;
diff --git a/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java b/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
index c87a925..000c252 100644
--- a/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
+++ b/java/src/com/android/inputmethod/latin/makedict/BinaryDictIOUtils.java
@@ -181,7 +181,7 @@
         final FileHeader header = BinaryDictInputOutput.readHeader(buffer);
         int wordPos = 0;
         final int wordLen = word.codePointCount(0, word.length());
-        for (int depth = 0; depth < Constants.Dictionary.MAX_WORD_LENGTH; ++depth) {
+        for (int depth = 0; depth < Constants.DICTIONARY_MAX_WORD_LENGTH; ++depth) {
             if (wordPos >= wordLen) return FormatSpec.NOT_VALID_WORD;
 
             do {
@@ -746,7 +746,7 @@
         final int[] codePoints = FusionDictionary.getCodePoints(word);
         final int wordLen = codePoints.length;
 
-        for (int depth = 0; depth < Constants.Dictionary.MAX_WORD_LENGTH; ++depth) {
+        for (int depth = 0; depth < Constants.DICTIONARY_MAX_WORD_LENGTH; ++depth) {
             if (wordPos >= wordLen) break;
             nodeOriginAddress = buffer.position();
             int nodeParentAddress = -1;
diff --git a/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java b/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
index e1e5e55..feadcda 100644
--- a/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
+++ b/java/src/com/android/inputmethod/latin/makedict/FormatSpec.java
@@ -167,7 +167,7 @@
 
     // TODO: Make this value adaptative to content data, store it in the header, and
     // use it in the reading code.
-    static final int MAX_WORD_LENGTH = Constants.Dictionary.MAX_WORD_LENGTH;
+    static final int MAX_WORD_LENGTH = Constants.DICTIONARY_MAX_WORD_LENGTH;
 
     static final int PARENT_ADDRESS_SIZE = 3;
     static final int FORWARD_LINK_ADDRESS_SIZE = 3;
diff --git a/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java b/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java
index 1132e4a..5a2b24c 100644
--- a/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java
+++ b/java/src/com/android/inputmethod/latin/makedict/FusionDictionary.java
@@ -462,7 +462,7 @@
             final ArrayList<WeightedString> shortcutTargets,
             final boolean isNotAWord, final boolean isBlacklistEntry) {
         assert(frequency >= 0 && frequency <= 255);
-        if (word.length >= Constants.Dictionary.MAX_WORD_LENGTH) {
+        if (word.length >= Constants.DICTIONARY_MAX_WORD_LENGTH) {
             MakedictLog.w("Ignoring a word that is too long: word.length = " + word.length);
             return;
         }
diff --git a/java/src/com/android/inputmethod/latin/UserHistoryDictionary.java b/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionary.java
similarity index 95%
rename from java/src/com/android/inputmethod/latin/UserHistoryDictionary.java
rename to java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionary.java
index 6cad371..a5d6f04 100644
--- a/java/src/com/android/inputmethod/latin/UserHistoryDictionary.java
+++ b/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionary.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.android.inputmethod.latin;
+package com.android.inputmethod.latin.personalization;
 
 import android.content.Context;
 import android.content.SharedPreferences;
@@ -23,6 +23,11 @@
 
 import com.android.inputmethod.annotations.UsedForTesting;
 import com.android.inputmethod.keyboard.ProximityInfo;
+import com.android.inputmethod.latin.Constants;
+import com.android.inputmethod.latin.Dictionary;
+import com.android.inputmethod.latin.ExpandableDictionary;
+import com.android.inputmethod.latin.LatinImeLogger;
+import com.android.inputmethod.latin.WordComposer;
 import com.android.inputmethod.latin.SuggestedWords.SuggestedWordInfo;
 import com.android.inputmethod.latin.makedict.FormatSpec.FormatOptions;
 import com.android.inputmethod.latin.settings.Settings;
@@ -152,8 +157,8 @@
      * The second word may not be null (a NullPointerException would be thrown).
      */
     public int addToUserHistory(final String word1, final String word2, final boolean isValid) {
-        if (word2.length() >= Constants.Dictionary.MAX_WORD_LENGTH ||
-                (word1 != null && word1.length() >= Constants.Dictionary.MAX_WORD_LENGTH)) {
+        if (word2.length() >= Constants.DICTIONARY_MAX_WORD_LENGTH ||
+                (word1 != null && word1.length() >= Constants.DICTIONARY_MAX_WORD_LENGTH)) {
             return -1;
         }
         if (mBigramListLock.tryLock()) {
@@ -244,8 +249,8 @@
 
             @Override
             public void setBigram(final String word1, final String word2, final int frequency) {
-                if (word1.length() < Constants.Dictionary.MAX_WORD_LENGTH
-                        && word2.length() < Constants.Dictionary.MAX_WORD_LENGTH) {
+                if (word1.length() < Constants.DICTIONARY_MAX_WORD_LENGTH
+                        && word2.length() < Constants.DICTIONARY_MAX_WORD_LENGTH) {
                     profTotal++;
                     if (DBG_SAVE_RESTORE) {
                         Log.d(TAG, "load bigram: " + word1 + "," + word2 + "," + frequency);
@@ -404,7 +409,8 @@
     }
 
     @UsedForTesting
-    void forceAddWordForTest(final String word1, final String word2, final boolean isValid) {
+    /* package for test */ void forceAddWordForTest(
+            final String word1, final String word2, final boolean isValid) {
         mBigramListLock.lock();
         try {
             addToUserHistory(word1, word2, isValid);
diff --git a/java/src/com/android/inputmethod/latin/UserHistoryDictionaryBigramList.java b/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryBigramList.java
similarity index 98%
rename from java/src/com/android/inputmethod/latin/UserHistoryDictionaryBigramList.java
rename to java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryBigramList.java
index 28941c4..b93630a 100644
--- a/java/src/com/android/inputmethod/latin/UserHistoryDictionaryBigramList.java
+++ b/java/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryBigramList.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.android.inputmethod.latin;
+package com.android.inputmethod.latin.personalization;
 
 import android.util.Log;
 
diff --git a/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java b/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
index 32eb0b2..d02f718 100644
--- a/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
+++ b/java/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtils.java
@@ -19,7 +19,6 @@
 import android.util.Log;
 
 import com.android.inputmethod.annotations.UsedForTesting;
-import com.android.inputmethod.latin.UserHistoryDictionaryBigramList;
 import com.android.inputmethod.latin.makedict.BinaryDictIOUtils;
 import com.android.inputmethod.latin.makedict.BinaryDictInputOutput;
 import com.android.inputmethod.latin.makedict.BinaryDictInputOutput.FusionDictionaryBufferInterface;
@@ -28,6 +27,7 @@
 import com.android.inputmethod.latin.makedict.FusionDictionary.Node;
 import com.android.inputmethod.latin.makedict.PendingAttribute;
 import com.android.inputmethod.latin.makedict.UnsupportedFormatException;
+import com.android.inputmethod.latin.personalization.UserHistoryDictionaryBigramList;
 
 import java.io.IOException;
 import java.io.OutputStream;
diff --git a/tests/src/com/android/inputmethod/latin/UserHistoryDictionaryTests.java b/tests/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryTests.java
similarity index 98%
rename from tests/src/com/android/inputmethod/latin/UserHistoryDictionaryTests.java
rename to tests/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryTests.java
index e0a0863..48eb08a 100644
--- a/tests/src/com/android/inputmethod/latin/UserHistoryDictionaryTests.java
+++ b/tests/src/com/android/inputmethod/latin/personalization/UserHistoryDictionaryTests.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package com.android.inputmethod.latin;
+package com.android.inputmethod.latin.personalization;
 
 import android.content.SharedPreferences;
 import android.preference.PreferenceManager;
diff --git a/tests/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtilsTests.java b/tests/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtilsTests.java
index 8c301f4..b679839 100644
--- a/tests/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtilsTests.java
+++ b/tests/src/com/android/inputmethod/latin/utils/UserHistoryDictIOUtilsTests.java
@@ -21,10 +21,10 @@
 import android.test.suitebuilder.annotation.LargeTest;
 import android.util.Log;
 
-import com.android.inputmethod.latin.UserHistoryDictionaryBigramList;
 import com.android.inputmethod.latin.makedict.FormatSpec;
 import com.android.inputmethod.latin.makedict.FusionDictionary;
 import com.android.inputmethod.latin.makedict.FusionDictionary.CharGroup;
+import com.android.inputmethod.latin.personalization.UserHistoryDictionaryBigramList;
 import com.android.inputmethod.latin.utils.ByteArrayWrapper;
 import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils.BigramDictionaryInterface;
 import com.android.inputmethod.latin.utils.UserHistoryDictIOUtils.OnAddWordListener;