diff --git a/README.md b/README.md
index dc21ba62..2319613b 100644
--- a/README.md
+++ b/README.md
@@ -5,6 +5,8 @@ Release folder of all projects.
 
 **Read [GacUI website](http://vczh-libraries.github.io/) or [the mirror website](http://gaclib.net) for more information.**
 
+The deepwiki website [indexed GacUI](https://deepwiki.com/vczh-libraries/GacUI), it provides high level ideas with acceptable accuracy, but it is problematic in details.
+
 Executables in `Tools` are no longer committed to this repo. **Read [Tools/README.md](Tools/README.md) for building tools.**
 
 Download code from [public releases](https://github.com/vczh-libraries/Release/releases) to get the latest stable release. Code from this repo is also usable but I don't make any promise. I will only make a new release when I think the code is ready to update.