diff --git a/api/application-service/definitions/protocol_metadata.yaml b/api/application-service/definitions/protocol_metadata.yaml
index 722640602..2b2c8f4e7 100644
--- a/api/application-service/definitions/protocol_metadata.yaml
+++ b/api/application-service/definitions/protocol_metadata.yaml
@@ -13,6 +13,8 @@
 # limitations under the License.
 type: object
 description: Dictionary of supported third party protocols.
+additionalProperties:
+  $ref: protocol.yaml
 example: {
   "irc": {
     "user_fields": ["network", "nickname"],