diff --git a/How-to-use-the-4G-extension.md b/How-to-use-the-4G-extension.md
index 6c132e1..46b84c6 100644
--- a/How-to-use-the-4G-extension.md
+++ b/How-to-use-the-4G-extension.md
@@ -2,7 +2,7 @@
 
 ## First we need to power on the 4G extension
 
-### cm4 
+### CM4 
 
 run `enable_4g_cm4.sh` or `uconsole-4g-cm enable`, depends on the version of your os image, both can do the same job