diff --git a/README.md b/README.md
index b127e04..85b45b5 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,9 @@ the bot will post the timeline from the specified Twitter/Tumblr accounts and RS
        "r/Clojure" "https://www.reddit.com/r/clojure/.rss"}
  :mastodon {:access_token "XXXX"
             :api_url "https://botsin.space/api/v1/"
-            :max-post-length 300}}
+            :max-post-length 300
+            ;; optional signature for posts
+            :signature "#newsbot"}}
 ```
 
 * the bot looks for `config.edn` at its relative path by default, an alternative location can be specified either using the `MASTODON_BOT_CONFIG` environment variable or passing the path to config as an argument
diff --git a/mastodon-bot.cljs b/mastodon-bot.cljs
index 706df37..790e750 100755
--- a/mastodon-bot.cljs
+++ b/mastodon-bot.cljs
@@ -49,7 +49,9 @@
    (post-status status-text nil))
   ([status-text media-ids]
    (.post mastodon-client "statuses"
-          (clj->js (merge {:status status-text}
+          (clj->js (merge {:status (if-let [signature (-> config :mastodon :signature)]
+                                     (str status-text "\n" signature)
+                                     status-text)}
                           (when media-ids {:media_ids media-ids}))))))
 
 (defn post-image [image-stream description callback]