+## Controlling external handlers for attachements
+
+You can choose e.g. which pdf viewer to invoke from notmuch-show mode by
+adding a .mailcap file in your home directory. Here is an example:
+
+ application/pdf; /usr/bin/mupdf %s; test=test "$DISPLAY" != ""; description=Portable Document Format; nametemplate=%s.pdf
+ application/x-pdf; /usr/bin/mupdf %s; test=test "$DISPLAY" != ""; description=Portable Document Format; nametemplate=%s.pdf
+