1 files changed, 3 insertions, 1 deletions

diff --git a/doc/asciidoc/fluxbox-keys.txt b/doc/asciidoc/fluxbox-keys.txt
index 399fc6b..d70495a 100644
--- a/doc/asciidoc/fluxbox-keys.txt
+++ b/doc/asciidoc/fluxbox-keys.txt
@@ -305,7 +305,9 @@ two arguments;;
 
 *SetHead* 'number'::
         Moves the window to the given display head. Only available when fluxbox
-        has been compiled with Xinerama support.
+        has been compiled with Xinerama support. Heads are numbered starting at *1*,
+        with the special value *0* meaning "Move to the head where the mouse pointer
+        currently resides".
 
 *SendToNextHead* ['offset'] / *SendToPrevHead* ['offset']::
         Sends the current window to the next/previous display head. If you