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-rw-r--r--synapse/state.py15
1 files changed, 15 insertions, 0 deletions
diff --git a/synapse/state.py b/synapse/state.py
index 1071635ac4..30b16e201a 100644
--- a/synapse/state.py
+++ b/synapse/state.py
@@ -457,6 +457,21 @@ def _seperate(state_sets):
     """Takes the state_sets and figures out which keys are conflicted and
     which aren't. i.e., which have multiple different event_ids associated
     with them in different state sets.
+
+    Args:
+        state_sets(list[dict[(str, str), str]]):
+            List of dicts of (type, state_key) -> event_id, which are the
+            different state groups to resolve.
+
+    Returns:
+        (dict[(str, str), str], dict[(str, str), set[str]]):
+            A tuple of (unconflicted_state, conflicted_state), where:
+
+            unconflicted_state is a dict mapping (type, state_key)->event_id
+            for unconflicted state keys.
+
+            conflicted_state is a dict mapping (type, state_key) to a set of
+            event ids for conflicted state keys.
     """
     unconflicted_state = dict(state_sets[0])
     conflicted_state = {}