diff --git a/docs/i3bar-protocol b/docs/i3bar-protocol
index bd8ea536..92763154 100644
--- a/docs/i3bar-protocol
+++ b/docs/i3bar-protocol
@@ -225,7 +225,7 @@ instance::
 	Instance of the block, if set
 x, y::
 	X11 root window coordinates where the click occured
-button:
+button::
 	X11 button ID (for example 1 to 3 for left/middle/right mouse button)
 
 *Example*: