diff --git a/docs/developer_guide.md b/docs/developer_guide.md
index fd0075b..14af14d 100644
--- a/docs/developer_guide.md
+++ b/docs/developer_guide.md
@@ -1,6 +1,6 @@
 # Developer's guide
 
-This guide assumes you have some knoweldge of [ActivityPub](https://activitypub.rocks/).
+This guide assumes you have some knowledge of [ActivityPub](https://activitypub.rocks/).
 
 [TOC]