diff --git a/data/com.github.alcinnz.odysseus.appdata.xml.in b/data/com.github.alcinnz.odysseus.appdata.xml.in
index 3ef4c0a..12fc333 100644
--- a/data/com.github.alcinnz.odysseus.appdata.xml.in
+++ b/data/com.github.alcinnz.odysseus.appdata.xml.in
@@ -39,7 +39,7 @@
 
   <developer_name>Adrian Cochrane</developer_name>
   <url type="homepage">https://odysseus.adrian.geek.nz/</url>
-  <url type="help">https://odysseus.adrian.geek.nz/guide</url>
+  <url type="help">https://odysseus.adrian.geek.nz/guide.html</url>
   <url type="bugtracker">https://github.com/alcinnz/Odysseus/issues</url>
   <update_contact>alcinnz@lavabit.com</update_contact>