diff --git a/specification/server_server_api.rst b/specification/server_server_api.rst
index d97f9d1f..43874321 100644
--- a/specification/server_server_api.rst
+++ b/specification/server_server_api.rst
@@ -941,7 +941,7 @@ following keys:
 ============== ===== ============
  Key            Type  Description
 ============== ===== ============
-``auth_chain`` List  A list of events giving the all of the events in the auth
+``auth_chain`` List  A list of events giving all of the events in the auth
                      chains for the join event and the events in ``state``.
 ``state``      List  A complete list of the prevailing state events at the
                      instant just before accepting the new ``m.room.member``