diff --git a/README.md b/README.md
index f42ea2d6..8e8fb079 100644
--- a/README.md
+++ b/README.md
@@ -164,7 +164,7 @@ following repository:
 
 https://github.com/VincentWei/mg-tests
 
-If you are interested in hacking the MiniGUI code, please use this repository.
+If you are interested in hacking the MiniGUI code, please visit this repository.
 
 
 ## NEW FEATURES IN VERSION 4.0.x
@@ -181,7 +181,15 @@ in order to support [HybridOS Foundation Class Library].
 * We tuned and optimized MiniGUI's logical and device font interfaces to
   support the new features above.
 
-* The NEWGAL engine of `drm` to support modern DRM-driven graphics cards on Linux.
+* MiniGUI now is enhanced to support input events which may be generated
+  by input devices other than standard mouse (or single-touch panel) and
+  keyboard, such as multi-touch panel (gesture), joystick, tablet tool,
+  table pad, and switch. In MiniGUI 4.0, we introduce `MSG_EXIN_XXX` messages
+  to support the input events from devices other than standard mouse
+  and keyboard. We call these messages as 'extra input messages'.
+
+* The NEWGAL engine of `dri` to support modern DRI/DRM-driven graphics cards
+  or GPUs on Linux.
 
 * The IAL engine of `libinput` to support all modern input devices including
   mouse, keyboard, joystick, switch, multiple touch panel, gesture, tablet tool,
@@ -351,15 +359,13 @@ A brief history description of the development progress lay below:
 1. Dec., 2017:     FMSoft updated MiniGUI and miniStudio for latest Linux distributions.
 1. Feb., 2018:     FMSoft released MiniGUI version 3.2.0.
 1. Apr., 2019:     FMSoft released MiniGUI version 3.2.2.
-1. Jun., 2019:     FMSoft released MiniGUI version 4.0.0.
+1. Jul., 2019:     FMSoft released MiniGUI version 4.0.0.
 
 ## ABOUT THE AUTHORS
 
 The original author of MiniGUI is WEI Yongming, and now MiniGUI is
-maintained by FMSoft. For more information, please browse
-our home page:
-
-http://www.fmsoft.cn.
+maintained by FMSoft. For more information, please refer to
+<http://www.fmsoft.cn>.
 
 
 ## IF YOU HAVE A PROBLEM
diff --git a/RELEASE-NOTES.md b/RELEASE-NOTES.md
index 495654fb..cd5a1045 100644
--- a/RELEASE-NOTES.md
+++ b/RELEASE-NOTES.md
@@ -262,9 +262,9 @@ the glyph orientation:
 - 'D': Glyphs are upside-down.
 - 'L': Glyphs are rotated 90 degrees counter-clockwise (sideways left).
 
-#### Support for Linux DRI
+#### Support for Linux DRI/DRM
 
-In order to support modern graphics cards or GPU, we introduced a
+In order to support modern graphics card or GPU, we introduced a
 new NEWGAL engine of `dri`. The developer can use this engine to
 run MiniGUI apps on a Linux box on which the DRI
 (Direct Rendering Infrastructure) is enabled.
@@ -278,7 +278,7 @@ MiniGUI mainly uses this library to support the dumb frame buffer
 (no hardware acceleration). However, you can write a driver for your
 graphics card or GPU to implement the hardware accelerated features.
 
-To avoid modifying the MiniGUI source code when supporting new GPUs,
+To avoid modifying the MiniGUI source code when supporting a new GPU,
 the `dri` engine has adopted a scalable design:
 
 * You can directly use the `dri` engine to run MiniGUI on a GPU
@@ -318,13 +318,13 @@ dpi=96
 
 You can use the key `dri.device` to specify your DRI device.
 
-You can use the key `dir.pixelformat` to specify the DRM pixel format for the
+You can use the key `dri.pixelformat` to specify the DRM pixel format for the
 screen. We use DRM fourcc code to defined the pixel format of the screen
 surface. For more information, please see `<drm/drm_fourcc.h>` header file.
 Note that only 8/16/24/32 bpp RGB formats are supported. For example, `XR24`
 means `X8R8G8B8` pixel format.
 
-Currently, the `dir` NEWGAL engine does not provide support for
+Currently, the `dri` NEWGAL engine does not provide support for
 MiniGUI-Processes run-time mode. We will enhance this in the subsequent
 version of MiniGUI.