diff --git a/customsrc/dired.org b/customsrc/dired.org
index 6e15524..da0e0e6 100644
--- a/customsrc/dired.org
+++ b/customsrc/dired.org
@@ -42,3 +42,13 @@ Ask before recursively deleting a directory, though.
 #+BEGIN_SRC emacs-lisp
 (setq dired-recursive-deletes 'top)
 #+END_SRC
+
+Open a file with an external program (that is, through xdg-open) by hitting C-c C-o.
+#+BEGIN_SRC emacs-lisp
+(defun dired-xdg-open ()
+  "In dired, open the file named on this line."
+  (interactive)
+  (let* ((file (dired-get-filename nil t)))
+    (call-process "xdg-open" nil 0 nil file)))
+(define-key dired-mode-map (kbd "C-c C-o") 'dired-xdg-open)
+#+END_SRC