diff --git a/java/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.java b/java/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.java
index d0f27a9a8..9dc1786c7 100644
--- a/java/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.java
+++ b/java/src/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.java
@@ -25,7 +25,23 @@ import java.util.HashMap;
 
 /**
  * !!!!! DO NOT EDIT THIS FILE !!!!!
- * This file is generated by tools/maketext.
+ *
+ * This file is generated by tools/maketext. The base template file is
+ *   tools/maketext/res/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.tmpl
+ *
+ * This file must be updated when any text resources in keyboard layout files have been changed.
+ * These text resources are referred as "!text/<resource_name>" in keyboard XML definitions,
+ * and should be defined in
+ *   tools/maketext/res/values-<locale>/donottranslate-more-keys.xml
+ *
+ * To update this file, please run the following commands.
+ *   $ cd $ANDROID_BUILD_TOP
+ *   $ mmm packages/inputmethods/LatinIME/tools/maketext
+ *   $ maketext -java packages/inputmethods/LatinIME/java/src
+ *
+ * The updated source file will be generated to the following path (this file).
+ *   packages/inputmethods/LatinIME/java/src/com/android/inputmethod/keyboard/internal/
+ *   KeyboardTextsSet.java
  */
 public final class KeyboardTextsSet {
     // Language to texts map.
diff --git a/tools/maketext/res/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.tmpl b/tools/maketext/res/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.tmpl
index 5a193388a..8df94c1aa 100644
--- a/tools/maketext/res/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.tmpl
+++ b/tools/maketext/res/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.tmpl
@@ -25,7 +25,23 @@ import java.util.HashMap;
 
 /**
  * !!!!! DO NOT EDIT THIS FILE !!!!!
- * This file is generated by tools/maketext.
+ *
+ * This file is generated by tools/maketext. The base template file is
+ *   tools/maketext/res/com/android/inputmethod/keyboard/internal/KeyboardTextsSet.tmpl
+ *
+ * This file must be updated when any text resources in keyboard layout files have been changed.
+ * These text resources are referred as "!text/<resource_name>" in keyboard XML definitions,
+ * and should be defined in
+ *   tools/maketext/res/values-<locale>/donottranslate-more-keys.xml
+ *
+ * To update this file, please run the following commands.
+ *   $ cd $ANDROID_BUILD_TOP
+ *   $ mmm packages/inputmethods/LatinIME/tools/maketext
+ *   $ maketext -java packages/inputmethods/LatinIME/java/src
+ *
+ * The updated source file will be generated to the following path (this file).
+ *   packages/inputmethods/LatinIME/java/src/com/android/inputmethod/keyboard/internal/
+ *   KeyboardTextsSet.java
  */
 public final class KeyboardTextsSet {
     // Language to texts map.