diff --git a/ebook/07.6.md b/ebook/07.6.md
index 57a4b9a5..b2383106 100644
--- a/ebook/07.6.md
+++ b/ebook/07.6.md
@@ -65,7 +65,7 @@
 
 - func Trim(s string, cutset string) string
 
-	在s字符串中去除cutset指定的字符串
+	在s字符串的头部和尾部去除cutset指定的字符串
 	
 		fmt.Printf("[%q]", strings.Trim(" !!! Achtung !!! ", "! "))
 		//Output:["Achtung"]