diff --git a/spmenu.conf documentation.md b/spmenu.conf documentation.md
index 57b14b7..6380af9 100644
--- a/spmenu.conf documentation.md	
+++ b/spmenu.conf documentation.md	
@@ -145,6 +145,9 @@ Tip: Use `Ctrl+f` to search this list, because it is quite long.
   - Description: Allow the window manager to manage spmenu as a window (0/1)
   - Type: Integer
   - Note: Only applies for X11
+- **spmenu.window.grabkeyboard**
+  - Description: Grab keyboard on runtime
+  - Type: Integer
 - **spmenu.window.alpha**
   - Description: Enable alpha (transparency) for spmenu
   - Type: Integer