diff --git a/gunicorn/config.py b/gunicorn/config.py
index ee10b9a5..5b3a56fb 100644
--- a/gunicorn/config.py
+++ b/gunicorn/config.py
@@ -514,6 +514,9 @@ class Workers(Setting):
         A positive integer generally in the 2-4 x $(NUM_CORES) range. You'll
         want to vary this a bit to find the best for your particular
         application's work load.
+
+        By default, the value of the WEB_CONCURRENCY environment variable. If
+        it is not defined, the default is 1.
         """