diff --git a/docs/userguide b/docs/userguide
index 547c7ba7..13ff3fe5 100644
--- a/docs/userguide
+++ b/docs/userguide
@@ -405,13 +405,16 @@ can configure mouse bindings in a similar way to key bindings.
 
 *Syntax*:
 ----------------------------------
-bindsym [--release] [--whole-window] [Modifiers+]button[n] command
+bindsym [--release] [--border] [--whole-window] [Modifiers+]button[n] command
 ----------------------------------
 
 By default, the binding will only run when you click on the titlebar of the
-window. If the +--whole-window+ flag is given, it will run when any part of the
-window is clicked. If the +--release+ flag is given, it will run when the mouse
-button is released.
+window. If the +--release+ flag is given, it will run when the mouse button
+is released.
+
+If the +--whole-window+ flag is given, the binding will also run when any part
+of the window is clicked, with the exception of the border. To have a bind run
+when the border is clicked, specify the +--border+ flag.
 
 *Examples*:
 --------------------------------