diff --git a/1.2.md b/1.2.md
index 1f5db4c77f5f42ac9180bd517b02fd63733c94c0..1800954bcc8188450811e65d8fed36242c30166c 100644
--- a/1.2.md
+++ b/1.2.md
@@ -70,6 +70,7 @@ GOPATH允许多个目录，当有多个目录时，请注意分隔符，多个GO
 
 	cd $GOPATH/src
 	mkdir mathapp
+	cd mathapp
 	vim main.go
 
 // `$GOPATH/src/mathapp/main.go`源码：