* subr.el (event-start): Say what a nil EVENT value means.

2 files changed, 4 insertions, 1 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index 81d8361366f..19c19fe77fa 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,5 +1,7 @@
 2014-02-10  Lars Ingebrigtsen  <larsi@gnus.org>
 
+        * subr.el (event-start): Say what a nil EVENT value means.
+
         * kmacro.el (kmacro-bind-to-key): Say that the parameter is unused
         (bug#14197).
 
diff --git a/lisp/subr.el b/lisp/subr.el
index 1d2163267d3..745d0b2f572 100644
--- a/lisp/subr.el
+++ b/lisp/subr.el
@@ -1019,7 +1019,8 @@ in the current Emacs session, then this function may return nil."
 
 (defun event-start (event)
   "Return the starting position of EVENT.
-EVENT should be a mouse click, drag, or key press event.
+EVENT should be a mouse click, drag, or key press event.  If
+EVENT is nil, the value of `posn-at-point' is used instead.
 
 The following accessor functions are used to access the elements
 of the position: