diff --git a/doc/api/v2/config/layer.rst b/doc/api/v2/config/layer.rst
index 1efa74ecda4170332d96603ca2253c68468474f9..7c22b67775274e31a25c995a248e8e7c654d53fe 100644
--- a/doc/api/v2/config/layer.rst
+++ b/doc/api/v2/config/layer.rst
@@ -59,6 +59,11 @@ context_projection
 ..  autoclass:: paddle.v2.layer.context_projection
     :noindex:
 
+row_conv
+--------
+..  autoclass:: paddle.v2.layer.row_conv
+    :noindex:
+
 Image Pooling Layer
 ===================
 
@@ -346,6 +351,12 @@ sampling_id
 ..  autoclass:: paddle.v2.layer.sampling_id
     :noindex:
 
+multiplex
+---------
+..  autoclass:: paddle.v2.layer.multiplex
+    :noindex:
+
+
 Slicing and Joining Layers
 ==========================
 
diff --git a/paddle/function/RowConvOpGpu.cu b/paddle/function/RowConvOpGpu.cu
index 06e2c2baac211a46597426250a55769113efbfd4..c0b947e224313abaf4fadfb8293dc78ca085ff84 100644
--- a/paddle/function/RowConvOpGpu.cu
+++ b/paddle/function/RowConvOpGpu.cu
@@ -312,8 +312,8 @@ void RowConvGrad<DEVICE_TYPE_GPU>(const GpuMatrix& outG,
     dim3 dimBlock(32, 32);
     dim3 dimGrid(DIVUP(width, dimBlock.x), 1);
     real* dw = filterG.getData();
-    if (contextLength <= 16) { 
-      KeRowConvBwWeight<32, 32, 16>
+    if (contextLength <= 32) { 
+      KeRowConvBwWeight<32, 32, 32>
         <<<dimGrid, dimBlock, 0, STREAM_DEFAULT>>>
         (dw, x, dy, starts, height, width, numSeq, contextLength);
     } else {