diff --git a/developer_manual/app/intro/index.rst b/developer_manual/app/intro/index.rst
index bc3a09328..efdd01a1b 100644
--- a/developer_manual/app/intro/index.rst
+++ b/developer_manual/app/intro/index.rst
@@ -1,5 +1,5 @@
 ======================
-App Developement Intro
+App Development Intro
 ======================
 
 .. toctree::