diff --git a/eBook/06.4.md b/eBook/06.4.md
index 1235ed0..267240b 100644
--- a/eBook/06.4.md
+++ b/eBook/06.4.md
@@ -170,7 +170,7 @@ func main() {
 entering: b
 in b
 entering: a
-win a
+in a
 leaving: a
 leaving: b
 ```