diff --git a/chapter01.tex b/chapter01.tex
index 6a055ed..3cd357b 100644
--- a/chapter01.tex
+++ b/chapter01.tex
@@ -3,7 +3,8 @@
 % Copyright 2007-2014 Victor Eijkhout
 % Translated by LiYanrui@bbs.ctex.org
 % Translated by zoho@bbs.ctex.org
-% Translated by Liam0205@bbs.ctex.org
+% Translated by Liam0205@bbs.ctex.org+
+% Date of translated: 2018-1-31
 \documentclass{book}
 
 \input{preamble}