diff --git a/doc/fluid/api/io/ComposeNotAligned.rst b/doc/fluid/api/io/ComposeNotAligned.rst
index 3968d80ce3cc5c174763c7b6161c80e3c3840042..c2f3f465b7dd287e22c5bdcf2401c40d5494d4f1 100644
--- a/doc/fluid/api/io/ComposeNotAligned.rst
+++ b/doc/fluid/api/io/ComposeNotAligned.rst
@@ -11,3 +11,4 @@ ComposeNotAligned
     :inherited-members:
     :noindex:
 
+This indicates an error state of compose API, which will raise when outputs of readers are not aligned.
diff --git a/doc/fluid/api_cn/io_cn/ComposeNotAligned_cn.rst b/doc/fluid/api_cn/io_cn/ComposeNotAligned_cn.rst
new file mode 100644
index 0000000000000000000000000000000000000000..1f4a911c5cb8b7dbad64807f81a4114e411ebeab
--- /dev/null
+++ b/doc/fluid/api_cn/io_cn/ComposeNotAligned_cn.rst
@@ -0,0 +1,14 @@
+..  THIS FILE IS GENERATED BY `gen_doc.{py|sh}`
+    !DO NOT EDIT THIS FILE MANUALLY!
+
+.. _api_fluid_io_ComposeNotAligned:
+
+ComposeNotAligned
+-----------------
+
+..  autoclass:: paddle.fluid.io.ComposeNotAligned
+    :members:
+    :inherited-members:
+    :noindex:
+
+表示一种错误状态，说明调用compose API时, reader的输出数据没有对齐。
diff --git a/scripts/api_white_list.txt b/scripts/api_white_list.txt
index 0e46fc3a89950c03b2219f1df0b633651c9269e8..778fa2be2de1e3e526a6f284e3b8f7e9d0eb34fc 100644
--- a/scripts/api_white_list.txt
+++ b/scripts/api_white_list.txt
@@ -6,3 +6,4 @@ transpiler_cn/memory_optimize_cn.rst
 transpiler_cn/release_memory_cn.rst
 transpiler_cn/RoundRobin_cn.rst
 optimizer_cn/Dpsgd_cn.rst
+io_cn/ComposeNotAligned_cn.rst