diff --git a/README.md b/README.md
index 7268d0d..4056dcc 100644
--- a/README.md
+++ b/README.md
@@ -2,3 +2,6 @@
 
 Adds syntax highlighting and snippet support to Nginx configuration files.
 Ported from [textmate/nginx](https://github.com/johnmuhl/nginx-tmbundle) for Atom.
+
+##How to use
+Give Nginx configuration files the extension `.conf` or `.nginx`