Doc fix for insert-pair-alist

* lisp/emacs-lisp/lisp.el (insert-pair-alist): Say what
COMMAND-CHAR is (bug#18809).

(cherry picked from commit 2824c587e9749a8f350f1d3dddd65176b4561dcb)

1 files changed, 5 insertions, 1 deletions

diff --git a/lisp/emacs-lisp/lisp.el b/lisp/emacs-lisp/lisp.el
index 764d01ce6db..ea7cce67be7 100644
--- a/lisp/emacs-lisp/lisp.el
+++ b/lisp/emacs-lisp/lisp.el
@@ -587,7 +587,11 @@ Interactively, the behavior depends on `narrow-to-defun-include-comments'."
 Each element looks like (OPEN-CHAR CLOSE-CHAR) or (COMMAND-CHAR
 OPEN-CHAR CLOSE-CHAR).  The characters OPEN-CHAR and CLOSE-CHAR
 of the pair whose key is equal to the last input character with
-or without modifiers, are inserted by `insert-pair'.")
+or without modifiers, are inserted by `insert-pair'.
+
+If COMMAND-CHAR is specified, it is a character that triggers the
+insertion of the open/close pair, and COMMAND-CHAR itself isn't
+inserted.")
 
 (defun insert-pair (&optional arg open close)
   "Enclose following ARG sexps in a pair of OPEN and CLOSE characters.