diff --git a/doc/fluid/api_cn/localsgd_cn.rst b/doc/fluid/api_cn/localsgd_cn.rst
index fffc1f26f1145b285f5e7c41934b25e850e2c6b7..1b2a307aeceaabf9f687639c4f81caf7f1bad99e 100644
--- a/doc/fluid/api_cn/localsgd_cn.rst
+++ b/doc/fluid/api_cn/localsgd_cn.rst
@@ -194,4 +194,5 @@ https://github.com/PaddlePaddle/Fleet/tree/develop/examples/local_sgd/resnet
 参考文献
 ---------
 [1] Lin T, Stich S U, Patel K K, et al. Don't Use Large Mini-Batches, Use Local SGD[J]. arXiv preprint arXiv:1808.07217, 2018.
+
 [2] Wang J, Joshi G. Adaptive communication strategies to achieve the best error-runtime trade-off in local-update SGD[J]. arXiv preprint arXiv:1810.08313, 2018.