diff --git a/api/client-server/create_room.yaml b/api/client-server/create_room.yaml
index c4a9c8ff..ce9ab46b 100644
--- a/api/client-server/create_room.yaml
+++ b/api/client-server/create_room.yaml
@@ -180,7 +180,8 @@ paths:
                   synchronised at first. Both users may subsequently choose to
                   tag the room differently.
                   This adds an ``is_direct`` flag to the content of any invites
-                  sent.
+                  sent, which will appear in the content of the `m.room.member`_
+                  event.
       responses:
         200:
           description: Information about the newly created room.
diff --git a/event-schemas/schema/m.room.member b/event-schemas/schema/m.room.member
index f9aa5051..adb9a831 100644
--- a/event-schemas/schema/m.room.member
+++ b/event-schemas/schema/m.room.member
@@ -39,6 +39,9 @@ properties:
           - leave
           - ban
         type: string
+      is_direct:
+        description: Flag indicating if this room was created with the intention of being a direct chat
+        type: boolean
       third_party_invite:
         properties:
           display_name: