diff --git a/README.md b/README.md
index e5d45b9..a53e840 100644
--- a/README.md
+++ b/README.md
@@ -33,6 +33,8 @@ Those keywords are:
 - `4/5`
 - `5/6`
 
+This plugin of support arbitrary width values follow by `w-`, such as `w-300`. This feature can be turned on in the plugin's settings.
+
 ## Position
 
 - `center`, the default
diff --git a/example.gif b/example.gif
index adb84f9..9f06ebb 100644
Binary files a/example.gif and b/example.gif differ