diff --git a/applications/mastodon.md b/applications/mastodon.md
index b92d5dd..24a2273 100644
--- a/applications/mastodon.md
+++ b/applications/mastodon.md
@@ -36,6 +36,8 @@ Moderation takes place at the server level in Mastodon. Each instance sets its o
 
 Mastodon has content warnings that admins can apply to warn users of the nature of the content before they click. Users can also report posts to moderators.
 
+Some documented [challenges with moderation in Mastodon](https://nolanlawson.com/2018/08/31/mastodon-and-the-challenges-of-abuse-in-a-federated-system/amp/) from 2018. One recommended solution is to provide open APIs for third-party tools to help with moderation, which was [added in 2019](https://github.com/tootsuite/mastodon/pull/9387).
+
 ### Social/Discovery
 
 There is [no unified global search in Mastodon](https://github.com/tootsuite/mastodon/issues/9529), as each server monitors a different set of messages. Searching for the same keyword on different instances yields different results. The federated timeline shows public posts that the user's server knows about. Essentially, users have access to posts of people followed by people on their instance.