Update README.md

Author: larswaechter

README.md

@@ -74,13 +74,13 @@ See the [demo app](https://github.com/larswaechter/markular/tree/main/projects/d
 
 On MacOS use CMD button instead of Ctrl.
 
-| Shortcut | Action                  |
-|----------|-------------------------|
-| Ctrl + b | Bold                    |
-| Ctrl + i | Italic                  |
-| Ctrl + z | Undo                    |
-| Ctrl + y | Redo                    |
-| Ctrl + k | Toggle editor / preview |
+| Shortcut         | Action                  |
+|------------------|-------------------------|
+| Ctrl + b         | Bold                    |
+| Ctrl + i         | Italic                  |
+| Ctrl + z         | Undo                    |
+| Ctrl + Shift + z | Redo                    |
+| Ctrl + k         | Toggle editor / preview |
 
 ## 👋 Shoutouts