diff --git a/sdks/python/apache_beam/metrics/cells.py b/sdks/python/apache_beam/metrics/cells.py
index e044693a6e9a..8b4b7e1271c2 100644
--- a/sdks/python/apache_beam/metrics/cells.py
+++ b/sdks/python/apache_beam/metrics/cells.py
@@ -318,7 +318,7 @@ def to_runner_api_monitoring_info_impl(self, name, transform_id):
 class BoundedTrieCell(AbstractMetricCell):
   """For internal use only; no backwards-compatibility guarantees.
 
-  Tracks the current value for a StringSet metric.
+  Tracks the current value for a BoundedTrie metric.
 
   Each cell tracks the state of a metric independently per context per bundle.
   Therefore, each metric has a different cell in each bundle, that is later