diff --git a/tools/cg/README.md b/tools/cg/README.md
index cad1c328..a837eeb5 100644
--- a/tools/cg/README.md
+++ b/tools/cg/README.md
@@ -2,15 +2,15 @@
 
 ###Usage
 ```
-php yaf_cg Sample
+php yaf_cg -d Sample
 ```
 
 will generator folder "Sample" under output:
 ```
-$ ls output/Sample/
+$ ls ./Sample/
 application/  conf/  index.php  readme.txt
 ```
 ```
-php yaf_cg Sample '' n
+php yaf_cg -d Sample -n
 will generate a namespace example
 ```