Update README.md

Author: CodeExplode

README.md

@@ -30,6 +30,8 @@ Not Implemented:
 * Negative search terms
 * WebP support, GIF playback
 
+To rename a tag, filter on just that tag, then enter batch mode with Ctrl B and change the tag for all images which use it
+
 It occasionally freezes when dragging in large batches of images, which I'm looking into. It's best to save beforehand.
 
 Using [an icon from flaticon](https://www.flaticon.com/free-icon/computer_8891318)