diff --git a/README.md b/README.md
index b54ffa4..4114d19 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,4 @@
 # BibTex
-
+## About merging bib files
+1. bib_merge.py: the merge script by WZL
+2. some other visual management tools like [JabRef](https://www.jabref.org/)