diff --git a/java/src/com/android/inputmethod/research/ResearchLogger.java b/java/src/com/android/inputmethod/research/ResearchLogger.java
index 3cad2d0..1410ba9 100644
--- a/java/src/com/android/inputmethod/research/ResearchLogger.java
+++ b/java/src/com/android/inputmethod/research/ResearchLogger.java
@@ -731,9 +731,16 @@
         stop();
     }
 
-    private static final String[] EVENTKEYS_USER_FEEDBACK = {
-        "UserFeedback", "FeedbackContents"
+    private static final String[] EVENTKEYS_PREFS_CHANGED = {
+        "PrefsChanged", "prefs"
     };
+    public static void prefsChanged(final SharedPreferences prefs) {
+        final ResearchLogger researchLogger = getInstance();
+        final Object[] values = {
+            prefs
+        };
+        researchLogger.enqueueEvent(EVENTKEYS_PREFS_CHANGED, values);
+    }
 
     // Regular logging methods
 
diff --git a/tools/dicttool/Android.mk b/tools/dicttool/Android.mk
index b0b47af..29aba8b 100644
--- a/tools/dicttool/Android.mk
+++ b/tools/dicttool/Android.mk
@@ -24,6 +24,7 @@
         $(filter-out $(addprefix %/, $(notdir $(LOCAL_TOOL_SRC_FILES))), $(LOCAL_MAIN_SRC_FILES)) \
         $(call all-java-files-under,tests)
 LOCAL_JAR_MANIFEST := etc/manifest.txt
+
 LOCAL_MODULE := dicttool_aosp
 LOCAL_JAVA_LIBRARIES := junit
 
diff --git a/tools/dicttool/etc/Android.mk b/tools/dicttool/etc/Android.mk
index 0c611b7..a0f5abd 100644
--- a/tools/dicttool/etc/Android.mk
+++ b/tools/dicttool/etc/Android.mk
@@ -16,4 +16,5 @@
 include $(CLEAR_VARS)
 
 LOCAL_PREBUILT_EXECUTABLES := dicttool_aosp makedict_aosp
+
 include $(BUILD_HOST_PREBUILT)