diff --git a/README.md b/README.md
index 14404fb..7cbf571 100644
--- a/README.md
+++ b/README.md
@@ -9,7 +9,7 @@ Setup
 1. Unpack in the `extensions`-folder of your mediawiki.
 2. Edit `Shariff/shariff-backend/index.php` and set the key
    `"domain":` to your domain name.
-3. Add `wfLoadExtension('Shariff.php');` to
+3. Add `wfLoadExtension('Shariff');` to
    `LocalSettings.php`
 4. Write `{{#shariffLike:}}` wherever you want to use social-media-buttons.