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-rw-r--r--synapse/util/caches/__init__.py3
1 files changed, 2 insertions, 1 deletions
diff --git a/synapse/util/caches/__init__.py b/synapse/util/caches/__init__.py
index b50e3503f0..43fd65d693 100644
--- a/synapse/util/caches/__init__.py
+++ b/synapse/util/caches/__init__.py
@@ -16,6 +16,7 @@
 
 import logging
 import os
+from typing import Dict
 
 import six
 from six.moves import intern
@@ -37,7 +38,7 @@ def get_cache_factor_for(cache_name):
 
 
 caches_by_name = {}
-collectors_by_name = {}
+collectors_by_name = {}  # type: Dict
 
 cache_size = Gauge("synapse_util_caches_cache:size", "", ["name"])
 cache_hits = Gauge("synapse_util_caches_cache:hits", "", ["name"])