diff --git a/zjuthesis.tex b/zjuthesis.tex
index 127e2924..400527c0 100644
--- a/zjuthesis.tex
+++ b/zjuthesis.tex
@@ -165,6 +165,9 @@
     \inputbody{post}
 }
 
+\addbibresource{body/ref.bib}
+% * add these line to enable ref suggest in vscode.
+
 \begin{document}
 
 \ifthenelse{\equal{\Degree}{undergraduate}}