diff --git a/sequence_tagging_for_ner/README_en.md b/sequence_tagging_for_ner/README_en.md
index 90042535a06b6ef958bb8c7efd9d40dcdf9bb446..b02a6508317952002202a313d32d73eebccbcd7b 100644
--- a/sequence_tagging_for_ner/README_en.md
+++ b/sequence_tagging_for_ner/README_en.md
@@ -172,4 +172,4 @@ Congratulations! job done.
 ## Reference
 
 1. Graves A. [Supervised Sequence Labelling with Recurrent Neural Networks](http://www.cs.toronto.edu/~graves/preprint.pdf)[J]. Studies in Computational Intelligence, 2013, 385.
-2. Collobert R, Weston J, Bottou L, et al. [Natural Language Processing (Almost) from Scratch](http://www.jmlr.org/papers/volume12/collobert11a/collobert11a.pdf)[J]. Journal of Machine Learning Research, 2011, 12(1):2493-2537.
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+2. Collobert R, Weston J, Bottou L, et al. [Natural Language Processing (Almost) from Scratch](http://www.jmlr.org/papers/volume12/collobert11a/collobert11a.pdf)[J]. Journal of Machine Learning Research, 2011, 12(1):2493-2537.