diff --git a/README.md b/README.md
index e8b62527..837e27f0 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,7 @@ A mature and proven cross-platform GUI system for embedded and smart IoT devices
 
   1. Introduction
   1. A brief building instruction
-  1. New features in version 3.4.x
+  1. New features in version 4.0.x
   1. New features in version 3.2.x
   1. The runtime modes of MiniGUI
   1. History
@@ -149,10 +149,10 @@ For more information, please run
 
 ## NEW FEATURES IN VERSION 4.0.x
 
-In this version, we enhanced and tuned the APIs related to text rendering.
+In this version, we enhanced and tuned the APIs related to text rendering,
 in order to support HybridOS Foundation C++ Library.
 
-* MiniGUI now provides complete APIs for Unicode characters process.
+* MiniGUI now provides complete APIs for Unicode characters processing.
   These APIs conform to Unicode 12.0.
 
 * MiniGUI also provides new APIs to lay out, shape, and render glyphs
diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index d793591e..3dc87438 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -10,9 +10,11 @@ Please report any bugs and incompatibilities in
 
 ### What's new in this version
 
-In this version, we mainly enhanced and tuned the APIs of text rendering.
+In this version, we mainly enhanced and tuned the APIs related to text
+rendering in order that MiniGUI can handle complex writing systems
+(scripts) like Arabic and Indic:
 
-* MiniGUI now provides complete APIs for Unicode characters process.
+* MiniGUI now provides complete APIs for Unicode characters processing.
   These APIs conform to Unicode 12.0.
 
 * MiniGUI also provides new APIs to lay out, shape, and render glyphs
@@ -24,6 +26,11 @@ In this version, we mainly enhanced and tuned the APIs of text rendering.
 * We introduced Slice Memoroy Allocator for fast concurrent memory chunk
   allocation.
 
+The new APIs also conform to the specification of CSS Text Module
+Level 3. Indeed, we design the APIs for HybridOS foundation class library,
+which will provide the ability to render Graphics User Interfaces in
+CSS way.
+
 #### New APIs conforming Unicode 12.0
 
 * New types: