diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 049eafc7621c980a5a313ad4be9358945592fc74..395a9c83c46292a4777b5b4bad34176e2d17bb1c 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -14,6 +14,10 @@
 - If you see any code which clearly violates the style guide, please fix it and send a pull request.
 - Every new source file must begin with a license header.
 
+## Sign the CLA
+
+Before you can contribute to JuiceFS, you will need to sign the [Contributor License Agreement](https://cla-assistant.io/juicedata/juicefs). There're a CLA assistant to guide you when you first time submit a pull request.
+
 ## What is a Good PR
 
 - Presence of unit tests