Update waybar-clock.5.scd

man/waybar-clock.5.scd

@@ -32,6 +32,10 @@ The *clock* module displays the current date and time.
 	typeof: string ++
 	Command to execute when clicked on the module.
 
+*on-click-middle*: ++
+	typeof: string ++
+	Command to execute when middle-clicked on the module using mousewheel.
+
 *on-click-right*: ++
 	typeof: string ++
 	Command to execute when you right clicked on the module.