diff --git a/doc/api/v2/config/layer.rst b/doc/api/v2/config/layer.rst
index 0ade7990193d710792bbff78f6b7d338549471f6..154cfe24432f3e43ed724a45273b4a582b45f73d 100644
--- a/doc/api/v2/config/layer.rst
+++ b/doc/api/v2/config/layer.rst
@@ -419,8 +419,8 @@ hsigmoid
 ..  autoclass:: paddle.v2.layer.hsigmoid
     :noindex:
 
-smooth_l1
----------
+smooth_l1_cost
+--------------
 ..  autoclass:: paddle.v2.layer.smooth_l1_cost
     :noindex: