diff --git a/README.md b/README.md
index 522d737..a7dd822 100644
--- a/README.md
+++ b/README.md
@@ -30,7 +30,7 @@ You also need to split all characters into train characters and val characters w
 > val_unis: \['8E21', ...]
 
 ### 2. Content-Reference mapping  
-It is a dict you have to create by yourself before start, you can find the full CR-mapping algorithm in `appendix`. Elements in dict also need to be converted into unicode format. Please assure keys of CR mapping contain both of `train_unis` and `val_unis`.     
+It is a dict you have to create by yourself before start, you can find the full CR-mapping algorithm in `appendix` and using the decompose dictionary of [LFFont](https://github.com/clovaai/lffont/blob/master/meta/chn_decompose.json). Elements in dict also need to be converted into unicode format. Please assure keys of CR mapping contain both of `train_unis` and `val_unis`.     
 > {content1: \[ref1, ref2, ref3, ...], content2: \[ref1, ref2, ref3, ...], ...}  
 
 example(in utf-8 format):