Update README.md

README.md

@@ -12,6 +12,8 @@ This is the filtered Japanese subset of [XL-Sum](https://huggingface.co/datasets
 **filters**
 - 15-gram overlap
 
+\* code: https://gist.github.com/mkshing/d6371cbfdd50d4f352cee247fd4dd86a
+
 **number of examples**
 - validation: 758 (before: 889)
 - test: 766 (before: 889)