Mention interactive call of buffer-disable-undo.

* doc/lispref/text.texi (Maintaining Undo): Mention interactive call of
buffer-disable-undo.

2 files changed, 7 insertions, 1 deletions

diff --git a/doc/lispref/ChangeLog b/doc/lispref/ChangeLog
index c5d9f5c8966..16f3f5bd296 100644
--- a/doc/lispref/ChangeLog
+++ b/doc/lispref/ChangeLog
@@ -1,3 +1,8 @@
+2013-08-17  Xue Fuqiao  <xfq.free@gmail.com>
+
+        * text.texi (Maintaining Undo): Mention interactive call of
+        buffer-disable-undo.
+
 2013-08-16  Xue Fuqiao  <xfq.free@gmail.com>
 
         * text.texi (Insertion): Refine.
diff --git a/doc/lispref/text.texi b/doc/lispref/text.texi
index f5607f6fe91..a1ab35bab06 100644
--- a/doc/lispref/text.texi
+++ b/doc/lispref/text.texi
@@ -1381,7 +1381,8 @@ possible to undo either previous changes or any subsequent changes.  If
 the undo list of @var{buffer-or-name} is already disabled, this function
 has no effect.
 
-This function returns @code{nil}.
+In an interactive call, BUFFER-OR-NAME is the current buffer.  You
+cannot specify any other buffer.  This function returns @code{nil}.
 @end deffn
 
   As editing continues, undo lists get longer and longer.  To prevent