diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index d541633f..dda3df23 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -1,4 +1,4 @@
-# Contributiton Guide
+# Contribution Guide
 
 You shouldn't edit the node class files (all files under `diagram` directory) by yourself.