add a note

Author: fdev31

site/scratchpads.md

@@ -8,6 +8,9 @@ commands:
     description: Hide the given scratchpad
   - name: attach
     description: Toggle attaching/anchoring the currently focused window to the (last used) scratchpad
+
+Note: show and hide can accept '*' as a parameter, applying changes to every scratchpad.
+
 ---
 # scratchpads