diff --git a/synapse/state.py b/synapse/state.py
index d0f76dc4f5..b6557ab98a 100644
--- a/synapse/state.py
+++ b/synapse/state.py
@@ -231,6 +231,7 @@ class StateHandler(object):
                 )
 
         logger.info("Resolving state for %s with %d groups", room_id, len(state_groups))
+        logger.info("State groups for %s with %r", room_id, group_names)
 
         new_state, prev_states = self._resolve_events(
             state_groups.values(), event_type, state_key