diff --git a/source/Ox.UI/js/Window/Tooltip.js b/source/Ox.UI/js/Window/Tooltip.js
index dcb2e457..1979f9ff 100644
--- a/source/Ox.UI/js/Window/Tooltip.js
+++ b/source/Ox.UI/js/Window/Tooltip.js
@@ -57,6 +57,7 @@ Ox.Tooltip = function(options, self) {
     /*@
     show <f> show tooltip
         (x, y) -> <o>  show tooltip at x,y
+        (event) -> <o>  show tooltip at event.clientX/clientY
     @*/
     that.show = function(x, y) {
         var last = Ox.last(arguments),