1 files changed, 1 insertions, 0 deletions
diff --git a/synapse/third_party_rules/access_rules.py b/synapse/third_party_rules/access_rules.py
index 7c97e79c2b..c71b7f21bf 100644
--- a/synapse/third_party_rules/access_rules.py
+++ b/synapse/third_party_rules/access_rules.py
@@ -367,6 +367,7 @@ class RoomAccessRules(object):
def _is_power_level_content_allowed(self, content, access_rule):
"""Check if a given power levels event is permitted under the given access rule.
+
It shouldn't be allowed if it either changes the default PL to a non-0 value or
gives a non-0 PL to a user that would have been forbidden from joining the room
under a more restrictive access rule.
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