diff --git a/python/paddle/fluid/metrics.py b/python/paddle/fluid/metrics.py
index 5e03caa60387fe8c37608948bf6a87d8edd56a94..25d43be3b7520b53cb2ff2af8583cea2330acfbf 100644
--- a/python/paddle/fluid/metrics.py
+++ b/python/paddle/fluid/metrics.py
@@ -709,7 +709,7 @@ class DetectionMAP(object):
 
     def reset(self, executor, reset_program=None):
         """
-        reset metric states at the begin of each pass/user specified batch.
+        Reset metric states at the begin of each pass/user specified batch.
 
         Args:
             executor(Executor): a executor for executing