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-rw-r--r--synapse/storage/search.py2
1 files changed, 2 insertions, 0 deletions
diff --git a/synapse/storage/search.py b/synapse/storage/search.py
index 1b987161e2..7d642e18ff 100644
--- a/synapse/storage/search.py
+++ b/synapse/storage/search.py
@@ -54,6 +54,8 @@ class SearchStore(SQLBaseStore):
         for clause in clauses:
             sql += " AND " + clause
 
+        # We add an arbitrary limit here to ensure we don't try to pull the
+        # entire table from the database.
         sql += " ORDER BY rank DESC LIMIT 500"
 
         results = yield self._execute(