diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 139ba8d21a..a0a2949743 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -103,6 +103,9 @@ Push the local commit to GitHub fork repo:
 git push origin bugfix-branch:bugfix-branch
 ```
 
+Note that since GitHub requires submitting code through `username + token` (instead of using `username + password` directly), you need to create a GitHub token from https://github.com/settings/tokens:
+<img width="1280" alt="image" src="https://user-images.githubusercontent.com/9625821/163524204-7fe0e6bf-9c8b-4b1a-ac65-6a0ac423eb16.png">
+
 ## 4. Create a Pull Request
 
 Go to the web page of GitHub fork repo, there would be a chance to create a Pull Request after pushing to a new branch, just click button "Compare & pull request" to do it. Then edit the description for proposed changes, which can just be copied from the commit message.