diff --git a/tmr-tex.cls b/tmr-tex.cls
index 419fd8c..7aaf719 100644
--- a/tmr-tex.cls
+++ b/tmr-tex.cls
@@ -247,6 +247,7 @@
 }
 
 
+
 %定义变量并暂存
 \newcommand*\doi[1]{\gdef\cup@doi{#1}}
 \@onlypreamble\doi