diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
new file mode 100644
index 00000000..33294ce7
--- /dev/null
+++ b/CONTRIBUTING.md
@@ -0,0 +1,8 @@
+# Contributing
+
+1. Do NOT send pull request to `master` branch.
+Please send to `dev` branch instead.
+Any PR to `master` branch will NOT be merged.
+
+2. For dns api support, read this guide first: https://github.com/acmesh-official/acme.sh/wiki/DNS-API-Dev-Guide
+You will NOT get any review without passing this guide.  You also need to fix the CI errors.
diff --git a/README.md b/README.md
index 3a697691..44a73e83 100644
--- a/README.md
+++ b/README.md
@@ -615,6 +615,8 @@ This project exists thanks to all the people who contribute.
 
 <a href="https://github.com/acmesh-official/acme.sh/graphs/contributors"><img src="https://opencollective.com/acmesh/contributors.svg?width=890&button=false" /></a>
 
+If you want to become a contributor make sure to read [CONTRIBUTING.md](./CONTRIBUTING.md).
+
 ### 💰 Financial Contributors
 
 Become a financial contributor and help us sustain our community. [[Contribute](https://opencollective.com/acmesh/contribute)]