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diff --git a/lisp/km-elfeed.el b/lisp/km-elfeed.el
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+;;; km-elfeed.el --- Extensions for elfeed
+
+;; Copyright (C) 2012-2016 Kyle Meyer <kyle@kyleam.com>
+
+;; Author: Kyle Meyer <kyle@kyleam.com>
+;; URL: https://github.com/kyleam/emacs.d
+
+;; This program is free software; you can redistribute it and/or modify
+;; it under the terms of the GNU General Public License as published by
+;; the Free Software Foundation, either version 3 of the License, or
+;; (at your option) any later version.
+
+;; This program is distributed in the hope that it will be useful,
+;; but WITHOUT ANY WARRANTY; without even the implied warranty of
+;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+;; GNU General Public License for more details.
+
+;; You should have received a copy of the GNU General Public License
+;; along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
+;;; Code:
+
+(defvar km/elfeed-tag-keys nil
+  "Keys used by `km/elfeed-set-tag' to select tags.
+? and . are reserved.")
+
+;;;###autoload
+(defun km/elfeed-set-tag ()
+  "Filter to a tag defined in `km/elfeed-tag-keys'.
+? and . are reserved for showing a help buffer and resetting the
+filter to the default, respectively."
+  (interactive)
+  (let ((tag-key (read-char-choice
+                  (concat "Tag [?. "
+                          (mapconcat (lambda (x) (char-to-string (car x)))
+                                     km/elfeed-tag-keys "")
+                          "]: ")
+                  (append (list ?. ??)
+                          (mapcar #'car km/elfeed-tag-keys)))))
+    (if (eq tag-key ??)
+        (with-current-buffer (get-buffer-create "*Elfeed tags*")
+          (erase-buffer)
+          (insert (format "\n.  default filter\n\n"))
+          (insert (mapconcat (lambda (x) (format "%c  %s" (car x) (cdr x)))
+                             km/elfeed-tag-keys
+                             "\n"))
+          (display-buffer (current-buffer)))
+      (elfeed-search-set-filter
+       (concat (default-value 'elfeed-search-filter)
+               (and (not (eq tag-key ?.))
+                    (format " +%s"
+                            (cdr (assq tag-key km/elfeed-tag-keys)))))))))
+
+(provide 'km-elfeed)
+;;; km-elfeed.el ends here