Doc fix for forward-word and backward-word.

* doc/lispref/positions.texi (Word Motion): Remove redundant sentence.
* lisp/simple.el (backward-word): Mention the optional argument.
* src/syntax.c (forward_word): Mention the optional argument.

2 files changed, 7 insertions, 1 deletions

diff --git a/lisp/ChangeLog b/lisp/ChangeLog
index ff9f4ff8707..0c8791d8af7 100644
--- a/lisp/ChangeLog
+++ b/lisp/ChangeLog
@@ -1,3 +1,7 @@
+2013-08-13  Xue Fuqiao  <xfq.free@gmail.com>
+
+        * simple.el (backward-word): Mention the optional argument.
+
 2013-08-13  Stefan Monnier  <monnier@iro.umontreal.ca>
 
         * frameset.el (frameset--make): Rename constructor from make-frameset.
diff --git a/lisp/simple.el b/lisp/simple.el
index 0edf5ca8d9c..6825c41becc 100644
--- a/lisp/simple.el
+++ b/lisp/simple.el
@@ -3338,6 +3338,7 @@ extract characters that are special to a buffer, and should not
 be copied into other buffers."
   (funcall filter-buffer-substring-function beg end delete))
 
+;; FIXME: `with-wrapper-hook' is obsolete
 (defun buffer-substring--filter (beg end &optional delete)
   (with-wrapper-hook filter-buffer-substring-functions (beg end delete)
     (cond
@@ -5670,7 +5671,8 @@ current object."
 
 (defun backward-word (&optional arg)
   "Move backward until encountering the beginning of a word.
-With argument ARG, do this that many times."
+With argument ARG, do this that many times.
+If ARG is omitted or nil, move point backward one word."
   (interactive "^p")
   (forward-word (- (or arg 1))))