diff --git a/source/chapter2/10_Properties.md b/source/chapter2/10_Properties.md
index 93ae0b9c..4ca72288 100755
--- a/source/chapter2/10_Properties.md
+++ b/source/chapter2/10_Properties.md
@@ -16,7 +16,7 @@
 
 
 >   2.2
->   翻译：[saitjr](https://github.com/saitjr)
+>   翻译：[saitjr](https://github.com/saitjr)，2016-04-11
 
 
 
@@ -435,4 +435,4 @@ print(rightChannel.currentLevel)
 // 输出 "10"
 print(AudioChannel.maxInputLevelForAllChannels)
 // 输出 "10"
-```
\ No newline at end of file
+```