diff --git a/api/funkwhale_api/instance/serializers.py b/api/funkwhale_api/instance/serializers.py
index 87dc1b139..7856df065 100644
--- a/api/funkwhale_api/instance/serializers.py
+++ b/api/funkwhale_api/instance/serializers.py
@@ -205,6 +205,14 @@ class Metadata21Serializer(MetadataSerializer):
     location = serializers.CharField()
     content = MetadataContentSerializer()
     features = serializers.ListField(child=serializers.CharField())
+    codeOfConduct = serializers.SerializerMethodField()
+
+    def get_codeOfConduct(self, obj) -> str:
+        return (
+            full_url("/about/pod#rules")
+            if obj["preferences"].get("instance__rules")
+            else ""
+        )
 
 
 class NodeInfo20Serializer(serializers.Serializer):
diff --git a/api/tests/instance/test_nodeinfo.py b/api/tests/instance/test_nodeinfo.py
index 4f31aee2a..e8896e3bd 100644
--- a/api/tests/instance/test_nodeinfo.py
+++ b/api/tests/instance/test_nodeinfo.py
@@ -155,6 +155,7 @@ def test_nodeinfo_21(api_client):
                     ("topPodcastCategories", []),
                 ]
             ),
+            "codeOfConduct": "",
         },
     }