diff --git a/README.md b/README.md
index 384eefe..5f82033 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,7 @@ services:
       - "JSI_BaseUrl=<your-url>"
       - "JSI_Account__Username=<your-username>"
       - "JSI_Account__Password=<your-password>"
+      - "JSI_CUSTOMIZATION__GENERATEDIDLENGTH=6" // optional, range 2 to 16, default: 6
 ```
 
 ## Redis