diff --git a/data/api/client-server/profile.yaml b/data/api/client-server/profile.yaml
index 9792a402..63ddeef6 100644
--- a/data/api/client-server/profile.yaml
+++ b/data/api/client-server/profile.yaml
@@ -278,6 +278,7 @@ paths:
                   displayname:
                     type: string
                 additionalProperties:
+                  x-addedInMatrixVersion: "1.14"
                   description:
                     Any additional profile field value; may be any valid JSON type, with keys following the
                     [Common Namespaced Identifier Grammar](/appendices/#common-namespaced-identifier-grammar).