diff --git a/zulip_bots/zulip_bots/bots/link_shortener/doc.md b/zulip_bots/zulip_bots/bots/link_shortener/doc.md
index 0982157..d24c2bc 100644
--- a/zulip_bots/zulip_bots/bots/link_shortener/doc.md
+++ b/zulip_bots/zulip_bots/bots/link_shortener/doc.md
@@ -3,6 +3,9 @@
 Link Shortener Bot is a Zulip bot that will shorten URLs ("links") in a
 conversation. It uses the [goo.gl URL shortener API] to shorten its links.
 
+Use [this](https://developers.google.com/url-shortener/v1/getting_started) to get
+your API Key.
+
 Links can be anywhere in the message, for example,
 
  > @**Link Shortener Bot** @**Joe Smith** See