diff --git a/README.md b/README.md
index 47f1862..8c48db9 100644
--- a/README.md
+++ b/README.md
@@ -71,6 +71,7 @@ responsive_image:
   extra_images:
     - assets/foo/bar.png
     - assets/bgs/*.png
+    - assets/avatars/*.{jpeg,jpg}
 ```
 
 ## Usage