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-rw-r--r--synapse/events/snapshot.py5
1 files changed, 5 insertions, 0 deletions
diff --git a/synapse/events/snapshot.py b/synapse/events/snapshot.py
index ec32008d5a..11605b34a3 100644
--- a/synapse/events/snapshot.py
+++ b/synapse/events/snapshot.py
@@ -27,12 +27,17 @@ class EventContext(object):
     ]
 
     def __init__(self):
+        # The current state including the current event
         self.current_state_ids = None
+        # The current state excluding the current event
         self.prev_state_ids = None
         self.state_group = None
+
         self.rejected = False
         self.push_actions = []
 
+        # A previously persisted state group and a delta between that
+        # and this state.
         self.prev_group = None
         self.delta_ids = None