diff --git a/en/application-dev/internationalization/i18n-guidelines.md b/en/application-dev/internationalization/i18n-guidelines.md
index 244734770314757986733edc03b597894aa8e75e..66b002200fc1c1965f1d3e741739685ae97236e6 100644
--- a/en/application-dev/internationalization/i18n-guidelines.md
+++ b/en/application-dev/internationalization/i18n-guidelines.md
@@ -1,6 +1,7 @@
-# Internationalization Development (i18n)
+# Internationalization Development (I18N)
-This development guide describes how to use i18n APIs that are not defined in ECMA 402.
+This module provides system-related or enhanced I18N capabilities, such as locale management, phone number formatting, and calendar, through supplementary I18N interfaces that are not defined in ECMA 402.
+The [Intl](intl-guidelines.md) module provides basic I18N capabilities through the standard I18N interfaces defined in ECMA 402. It works with the I18N module to provide a complete suite of I18N capabilities.
## 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 9eceb50b876b05c960518ff554f65ec09963c0c9..378ea532cde2618b55ecced01f05a697eb629805 100644
--- a/en/application-dev/internationalization/intl-guidelines.md
+++ b/en/application-dev/internationalization/intl-guidelines.md
@@ -1,6 +1,7 @@
-# Internationalization Development (intl)
+# Internationalization Development (Intl)
-This development guide describes how to use i18n APIs that are defined in ECMA 402.
+This module provides basic I18N capabilities, such as time and date formatting, number formatting, and string sorting, through the standard I18N interfaces defined in ECMA 402.
+The [I18N](i18n-guidelines.md) module provides enhanced I18N capabilities through supplementary interfaces that are not defined in ECMA 402. It works with the Intl module to provide a complete suite of I18N capabilities.
> **NOTE**
> In the code snippets in this document, **intl** refers to the name of the imported module.
diff --git a/en/application-dev/reference/apis/js-apis-i18n.md b/en/application-dev/reference/apis/js-apis-i18n.md
index dc9f7442dab9fd1b39f12cf3fff71bfd83c13551..5c45f18dc00dba05a5615311c968f342cd6684d3 100644
--- a/en/application-dev/reference/apis/js-apis-i18n.md
+++ b/en/application-dev/reference/apis/js-apis-i18n.md
@@ -1,9 +1,9 @@
-# Internationalization – i18n
+# Internationalization – I18N
> **NOTE**
> - The initial APIs of this module are supported since API version 7. Newly added APIs will be marked with a superscript to indicate their earliest API version.
>
-> - This module contains enhanced i18n APIs, which are not defined in ECMA 402.
+> - This module provides system-related or enhanced I18N capabilities, such as locale management, phone number formatting, and calendar, through supplementary I18N interfaces that are not defined in ECMA 402. For details about the basic I18N capabilities, see [Intl](js-apis-intl.md).
## Modules to Import
diff --git a/en/application-dev/reference/apis/js-apis-intl.md b/en/application-dev/reference/apis/js-apis-intl.md
index 2ae9a62bcd2d4a436cfdef61c31383ed929b09b6..d9be9b9a2cbc59fb48e2beae81da77d05be9c84f 100644
--- a/en/application-dev/reference/apis/js-apis-intl.md
+++ b/en/application-dev/reference/apis/js-apis-intl.md
@@ -1,10 +1,9 @@
-# Internationalization – intl
+# Internationalization – Intl
> ![icon-note.gif](public_sys-resources/icon-note.gif) **NOTE**
> - The initial APIs of this module are supported since API version 6. Newly added APIs will be marked with a superscript to indicate their earliest API version.
>
-> - This module contains standard i18n APIs, which are defined in ECMA 402.
-
+> - This module provides basic I18N capabilities, such as time and date formatting, number formatting, and string sorting, through the standard I18N interfaces defined in ECMA 402. For details about the enhanced I18N capabilities, see [I18N](js-apis-i18n.md).
## Modules to Import