diff --git a/en/application-dev/internationalization/i18n-guidelines.md b/en/application-dev/internationalization/i18n-guidelines.md
index 0ded9fd39da8131472cdb600ffd6d3ebc7daff5f..1be7b7dff8fe59b423fa2766b81dc6c164aeec31 100644
--- a/en/application-dev/internationalization/i18n-guidelines.md
+++ b/en/application-dev/internationalization/i18n-guidelines.md
@@ -1,5 +1,6 @@
 # Internationalization Development (i18n)
 
+This development guide describes how to use i18n APIs that are not defined in ECMA 402.
 
 ## Obtaining System Language and Region Information
 
diff --git a/en/application-dev/internationalization/intl-guidelines.md b/en/application-dev/internationalization/intl-guidelines.md
index 57db3492c9c5a0f5d3bd2bc32f6d10db330f9b7c..76c00eb557816681efb54e9e7ec5d0a3754471b6 100644
--- a/en/application-dev/internationalization/intl-guidelines.md
+++ b/en/application-dev/internationalization/intl-guidelines.md
@@ -1,5 +1,6 @@
 # Internationalization Development (intl)
 
+This development guide describes how to use i18n APIs that are defined in ECMA 402.
 
 ## Setting Locale Information