diff --git a/README.md b/README.md
index 3e2cc4c..8ad7169 100644
--- a/README.md
+++ b/README.md
@@ -22,7 +22,16 @@
 - `joj3-config-generator convert` function is now supported, currently support one argument as input, it indicates the **convert root**
   - default value on the server can be given as `/home/tt/.config/joj`
   - **NOTE:** the user should ensure that the ideal `repo.toml` file is in the sub-directory of the **convert root**
-  - the intended immutable files should be placed at same position as the `repo.toml` file
+  - the intended immutable files should be placed at a sub-directory named `immutable_files` at same position as the `repo.toml` file
+
+```shell
+[nuvole0217@Nuvole test]$ tree .
+.
+|- immutable_files
+| |-- push.yaml
+| |-- release.yaml
+|-- repo.toml
+```
 
 - sample command on the server
 ```shell