diff --git a/INSTALL.md b/INSTALL.md
index 2f2a1a6d12..7b68ce9d98 100644
--- a/INSTALL.md
+++ b/INSTALL.md
@@ -46,7 +46,7 @@ cd build
 make
 ```
 
-## 2.1 Makefile
+## 2.2 Makefile
 The Makefile building system is deprecated.
 
 ### Build dependent libraries