diff --git a/doc/api/v2/config/layer.rst b/doc/api/v2/config/layer.rst
index d81481ca819c13ee0e299c204f998f3915c34bd4..ddf0b055a92d80295b24255a5462d477e0d9c796 100644
--- a/doc/api/v2/config/layer.rst
+++ b/doc/api/v2/config/layer.rst
@@ -252,6 +252,11 @@ first_seq
 ..  autoclass:: paddle.v2.layer.first_seq
     :noindex:
 
+sub_seq
+---------
+..  autoclass:: paddle.v2.layer.sub_seq
+    :noindex:
+
 concat
 ------
 ..  autoclass:: paddle.v2.layer.concat