* doc/emacs/rmail.texi (Rmail Display): Mention rmail-epa-decrypt.

* etc/NEWS: Related markup.
* lisp/mail/rmail.el: Comment.

doc/emacs/ChangeLog

 2012-02-08  Glenn Morris  <rgm@gnu.org>
 
+	* rmail.texi (Rmail Display): Mention rmail-epa-decrypt.
+
 	* text.texi (LaTeX Editing): Mention latex-electric-env-pair-mode.
 
 2012-02-07  Glenn Morris  <rgm@gnu.org>

doc/emacs/rmail.texi

@@ -1118,7 +1118,7 @@ buffer before sorting it.
 @section Display of Messages
 
   This section describes how Rmail displays mail headers,
-@acronym{MIME} sections and attachments, and URLs.
+@acronym{MIME} sections and attachments, URLs, and encrypted messages.
 
 @table @kbd
 @item t
@@ -1209,6 +1209,12 @@ variable @code{rmail-enable-mime} to @code{nil}.  When this is the
 case, the @kbd{v} (@code{rmail-mime}) command instead creates a
 temporary buffer to display the current @acronym{MIME} message.
 
+@findex rmail-epa-decrypt
+@cindex encrypted mails (reading in Rmail)
+  If the current message is an encrypted one, use the command @kbd{M-x
+rmail-epa-decrypt} to decrypt it, using the EasyPG library
+(@pxref{Top,,, epa, EasyPG Assistant User's Manual}).
+
   You can highlight and activate URLs in the Rmail buffer using Goto
 Address mode:
 

etc/NEWS

@@ -762,6 +762,7 @@ more variants, including Mercury, and a lot more.
 
 ** Rmail
 
++++
 *** The command `rmail-epa-decrypt' decrypts OpenPGP data
 in the Rmail incoming message.
 

lisp/mail/rmail.el

@@ -4363,6 +4363,9 @@ encoded string (and the same mask) will decode the string."
      (setq i (1+ i)))
    (concat string-vector)))
 
+;; Should this have a key-binding, or be in a menu?
+;; There doesn't really seem to be an appropriate menu.
+;; Eg the edit command is not in a menu either.
 (defun rmail-epa-decrypt ()
   "Decrypt OpenPGP armors in current message."
   (interactive)