diff --git a/gunicorn/config.py b/gunicorn/config.py
index 1a6a33ea..8f3498d5 100644
--- a/gunicorn/config.py
+++ b/gunicorn/config.py
@@ -1658,5 +1658,5 @@ class StatsdPrefix(Setting):
     default = ""
     validator = validate_string
     desc = """\
-    prefix to use when emitting statsd metrics
+    prefix to use when emitting statsd metrics (a trailing . is added, if not provided)
     """