diff --git a/fastNLP/io/loader/summarization.py b/fastNLP/io/loader/summarization.py
index eab3c037..f9e4ba8e 100644
--- a/fastNLP/io/loader/summarization.py
+++ b/fastNLP/io/loader/summarization.py
@@ -24,7 +24,7 @@ class ExtCNNDMLoader(JsonLoader):
 
        "['I got new tires from them and... ','...']", "['The new tires...','...']", "[0, 1]", "cnndm"
        "['Don't waste your time.  We had two...','...']", "['Time is precious','...']", "[1]", "cnndm"
-       "["..."]", "["..."]", "[]", "cnndm"
+       "['...']", "['...']", "[]", "cnndm"
 
     """