service/forum.md

-Discourse is a web platform for hosting and moderating online discussion.
+[Discourse][] is a web platform for hosting and moderating online discussion.
 
-The Tor forum is currently hosted free of charge by Discourse.org for the
+The [Tor forum][] is currently hosted free of charge by Discourse.org for the
 benefit of the Tor community.
 
 [Discourse]: https://www.discourse.org/