diff --git a/eBook/05.4.md b/eBook/05.4.md
index 3e0e135..601377e 100644
--- a/eBook/05.4.md
+++ b/eBook/05.4.md
@@ -51,7 +51,7 @@ This is the 4 iteration
 您可以将两个 for 循环嵌套起来：
 
 ```
-for i:=0; i<5; ji++ {
+for i:=0; i<5; i++ {
 	for j:=0; j<10; j++ {
 		println(j)
 	}