* eww.texi (Basics): Document eww PDF viewing.

doc/misc/ChangeLog

+2014-12-05  Lars Magne Ingebrigtsen  <larsi@gnus.org>
+
+	* eww.texi (Basics): Document eww PDF viewing.
+
 2014-11-23  Ivan Shmakov  <ivan@siamics.net>
 
 	* eww.texi (Advanced): Mention the Desktop stuff (bug#18010).

doc/misc/eww.texi

@@ -135,6 +135,12 @@ keep their number within a set limit, as specified by
 also be set to @code{nil} to allow for the history list to grow
 indefinitely.
 
+@cindex PDF
+  PDFs are viewed inline, by default, with @code{doc-view-mode}, but
+this can be customized by using the mailcap (@pxref{mailcap,,,
+emacs-mime, Emacs MIME Manual})
+mechanism, in particular @code{mailcap-mime-data}.
+
 @findex eww-add-bookmark
 @findex eww-list-bookmarks
 @kindex b