diff --git a/java/res/values-land/config.xml b/java/res/values-land/config.xml
index 7d93cc2ff..8cf7d95af 100644
--- a/java/res/values-land/config.xml
+++ b/java/res/values-land/config.xml
@@ -18,6 +18,7 @@
 */
 -->
 
+<!-- Configuration values for Small Phone Landscape. -->
 <resources>
     <bool name="config_use_fullscreen_mode">true</bool>
 </resources>
diff --git a/java/res/values-land/dimens.xml b/java/res/values-land/dimens.xml
index c97e68f11..c2b360a42 100644
--- a/java/res/values-land/dimens.xml
+++ b/java/res/values-land/dimens.xml
@@ -18,6 +18,7 @@
 */
 -->
 
+<!-- Configurable dimensions for Small Phone Landscape. -->
 <resources>
     <!-- Preferable keyboard height in absolute scale: 1.100in -->
     <!-- This keyboardHeight value should match with keyboard-heights.xml -->
diff --git a/java/res/values-sw540dp-land/config.xml b/java/res/values-sw540dp-land/config.xml
index b3cd7278d..796f14838 100644
--- a/java/res/values-sw540dp-land/config.xml
+++ b/java/res/values-sw540dp-land/config.xml
@@ -18,6 +18,7 @@
 */
 -->
 
+<!-- Configuration values for Large Phone and Small Tablet Landscape. -->
 <resources>
     <bool name="config_use_fullscreen_mode">false</bool>
 </resources>
diff --git a/java/res/values-sw540dp-land/dimens.xml b/java/res/values-sw540dp-land/dimens.xml
index 002493798..35b2009b2 100644
--- a/java/res/values-sw540dp-land/dimens.xml
+++ b/java/res/values-sw540dp-land/dimens.xml
@@ -18,6 +18,7 @@
 */
 -->
 
+<!-- Configurable dimensions for Large Phone and Small Tablet Landscape. -->
 <resources>
     <!-- Preferable keyboard height in absolute scale: 45.0mm -->
     <!-- This keyboardHeight value should match with keyboard-heights.xml -->
diff --git a/java/res/values-sw540dp/config.xml b/java/res/values-sw540dp/config.xml
index b1e578366..1900294bd 100644
--- a/java/res/values-sw540dp/config.xml
+++ b/java/res/values-sw540dp/config.xml
@@ -18,6 +18,7 @@
 */
 -->
 
+<!-- Configuration values for Large Phone and Small Tablet Portrait. -->
 <resources>
     <bool name="config_enable_show_option_of_key_preview_popup">false</bool>
     <!-- Whether or not Popup on key press is enabled by default -->
diff --git a/java/res/values-sw540dp/dimens.xml b/java/res/values-sw540dp/dimens.xml
index 801b7acb5..27b8342d1 100644
--- a/java/res/values-sw540dp/dimens.xml
+++ b/java/res/values-sw540dp/dimens.xml
@@ -18,6 +18,7 @@
 */
 -->
 
+<!-- Configurable dimensions for Large Phone and Small Tablet Portrait. -->
 <resources>
     <!-- Preferable keyboard height in absolute scale: 48.0mm -->
     <!-- This keyboardHeight value should match with keyboard-heights.xml -->
diff --git a/java/res/values-sw600dp/config.xml b/java/res/values-sw600dp/config.xml
index e72e4941e..c2419b639 100644
--- a/java/res/values-sw600dp/config.xml
+++ b/java/res/values-sw600dp/config.xml
@@ -18,6 +18,7 @@
 */
 -->
 
+<!-- Configuration values for Small Tablet Portrait. -->
 <resources>
     <bool name="config_enable_show_voice_key_option">false</bool>
 </resources>
diff --git a/java/res/values-sw768dp-land/config.xml b/java/res/values-sw768dp-land/config.xml
index b3cd7278d..7490e52ce 100644
--- a/java/res/values-sw768dp-land/config.xml
+++ b/java/res/values-sw768dp-land/config.xml
@@ -18,6 +18,7 @@
 */
 -->
 
+<!-- Configuration values for Large Tablet Landscape. -->
 <resources>
     <bool name="config_use_fullscreen_mode">false</bool>
 </resources>
diff --git a/java/res/values-sw768dp-land/dimens.xml b/java/res/values-sw768dp-land/dimens.xml
index 653f5e7d5..47c9b15b5 100644
--- a/java/res/values-sw768dp-land/dimens.xml
+++ b/java/res/values-sw768dp-land/dimens.xml
@@ -18,6 +18,7 @@
 */
 -->
 
+<!-- Configurable dimensions for Large Tablet Landscape. -->
 <resources>
     <!-- Preferable keyboard height in absolute scale: 58.0mm -->
     <!-- This keyboardHeight value should match with keyboard-heights.xml -->
diff --git a/java/res/values-sw768dp/config.xml b/java/res/values-sw768dp/config.xml
index a3f5de95b..ca1f8bd2e 100644
--- a/java/res/values-sw768dp/config.xml
+++ b/java/res/values-sw768dp/config.xml
@@ -18,6 +18,7 @@
 */
 -->
 
+<!-- Configuration values for Large Tablet Portrait. -->
 <resources>
     <bool name="config_enable_show_voice_key_option">false</bool>
     <bool name="config_enable_show_option_of_key_preview_popup">false</bool>
diff --git a/java/res/values-sw768dp/dimens.xml b/java/res/values-sw768dp/dimens.xml
index 4671aa28b..e1c68ea06 100644
--- a/java/res/values-sw768dp/dimens.xml
+++ b/java/res/values-sw768dp/dimens.xml
@@ -18,6 +18,7 @@
 */
 -->
 
+<!-- Configurable dimensions for Large Tablet Portrait. -->
 <resources>
     <!-- Preferable keyboard height in absolute scale: 48.0mm -->
     <!-- This keyboardHeight value should match with keyboard-heights.xml -->
diff --git a/java/res/values/config.xml b/java/res/values/config.xml
index 669a6612c..1a9e0507d 100644
--- a/java/res/values/config.xml
+++ b/java/res/values/config.xml
@@ -18,6 +18,7 @@
 */
 -->
 
+<!-- Configuration values for Small Phone Portrait. -->
 <resources>
     <bool name="config_use_fullscreen_mode">false</bool>
     <bool name="config_enable_show_voice_key_option">true</bool>
diff --git a/java/res/values/dimens.xml b/java/res/values/dimens.xml
index 4588b10eb..7cb8e8202 100644
--- a/java/res/values/dimens.xml
+++ b/java/res/values/dimens.xml
@@ -18,6 +18,7 @@
 */
 -->
 
+<!-- Configurable dimensions for Small Phone Portrait. -->
 <resources>
     <!-- Preferable keyboard height in absolute scale: 1.285in -->
     <!-- This keyboardHeight value should match with keyboard-heights.xml -->