diff --git a/known-software.json b/known-software.json
index eba5902..3b43d86 100644
--- a/known-software.json
+++ b/known-software.json
@@ -136,7 +136,8 @@
             ],
             "groups": [
                 "misskey-compliant",
-                "misskey-v13"
+                "misskey-v13",
+                "mastodon-compliant-api"
             ],
             "forkOf": "misskey"
         },