diff --git a/sources/tech/20170213 A beginners guide to understanding sudo on Ubuntu.md b/sources/tech/20170213 A beginners guide to understanding sudo on Ubuntu.md
index e85f7b9f45..681c337afc 100644
--- a/sources/tech/20170213 A beginners guide to understanding sudo on Ubuntu.md	
+++ b/sources/tech/20170213 A beginners guide to understanding sudo on Ubuntu.md	
@@ -1,3 +1,5 @@
+translating by ypingcn
+
 A beginner's guide to understanding sudo on Ubuntu
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