diff --git a/java/res/values/attrs.xml b/java/res/values/attrs.xml
index 78cf34d..0550606 100644
--- a/java/res/values/attrs.xml
+++ b/java/res/values/attrs.xml
@@ -111,6 +111,7 @@
         <attr name="keyPreviewOffset" format="dimension" />
         <!-- Height of the key press feedback popup. -->
         <attr name="keyPreviewHeight" format="dimension" />
+        <!-- TODO: consolidate key preview linger timeout with the key preview animation parameters. -->
         <!-- Delay after key releasing and key press feedback dismissing in millisecond -->
         <attr name="keyPreviewLingerTimeout" format="integer" />
         <!-- Layout resource for more keys keyboard -->
diff --git a/java/res/values/config-common.xml b/java/res/values/config-common.xml
index 1b44bad..224aabd 100644
--- a/java/res/values/config-common.xml
+++ b/java/res/values/config-common.xml
@@ -35,10 +35,11 @@
 
     <integer name="config_ignore_alt_code_key_timeout">350</integer>
 
-    <integer name="config_key_preview_show_up_duration">35</integer>
-    <integer name="config_key_preview_dismiss_duration">40</integer>
-    <fraction name="config_key_preview_show_up_start_scale">70%</fraction>
-    <fraction name="config_key_preview_dismiss_end_scale">70%</fraction>
+    <integer name="config_key_preview_show_up_duration">0</integer>
+    <integer name="config_key_preview_dismiss_duration">70</integer>
+    <fraction name="config_key_preview_show_up_start_scale">100%</fraction>
+    <fraction name="config_key_preview_dismiss_end_scale">100%</fraction>
+    <!-- TODO: consolidate key preview linger timeout with the above animation parameters. -->
     <integer name="config_key_preview_linger_timeout">70</integer>
     <!-- Suppress showing key preview duration after batch input in millisecond -->
     <integer name="config_suppress_key_preview_after_batch_input_duration">1000</integer>
diff --git a/java/res/values/themes-common.xml b/java/res/values/themes-common.xml
index fc96d19..eb6cdd9 100644
--- a/java/res/values/themes-common.xml
+++ b/java/res/values/themes-common.xml
@@ -77,6 +77,7 @@
         <item name="ignoreAltCodeKeyTimeout">@integer/config_ignore_alt_code_key_timeout</item>
         <item name="keyPreviewLayout">@layout/key_preview</item>
         <item name="keyPreviewHeight">@dimen/config_key_preview_height</item>
+        <!-- TODO: consolidate key preview linger timeout with the key preview animation parameters. -->
         <item name="keyPreviewLingerTimeout">@integer/config_key_preview_linger_timeout</item>
         <item name="moreKeysKeyboardLayout">@layout/more_keys_keyboard</item>
         <item name="showMoreKeysKeyboardAtTouchedPoint">@bool/config_show_more_keys_keyboard_at_touched_point</item>
diff --git a/java/res/xml/prefs.xml b/java/res/xml/prefs.xml
index 49f0718..a39ce4a 100644
--- a/java/res/xml/prefs.xml
+++ b/java/res/xml/prefs.xml
@@ -175,6 +175,7 @@
                 android:fragment="com.android.inputmethod.latin.settings.AdditionalSubtypeSettings"
                 android:key="custom_input_styles"
                 android:title="@string/custom_input_styles_title" />
+            <!-- TODO: consolidate key preview dismiss delay with the key preview animation parameters. -->
             <ListPreference
                 android:key="pref_key_preview_popup_dismiss_delay"
                 android:title="@string/key_preview_popup_dismiss_delay" />