diff --git a/README.md b/README.md
index 39cfc23..c766670 100644
--- a/README.md
+++ b/README.md
@@ -31,7 +31,7 @@ Export Variables
 export BS_URL=https://bookstack.example.com # Set to be your BookStack base URL
 export BS_TOKEN_ID=abc123 # Set to be your API token_id
 export BS_TOKEN_SECRET=123abc # Set to be your API token_secret
-export BS_CSS_FILE # Set to be the name of your CSS markdown file
+export BS_CSS_FILE=style.css # Set to be the name of your CSS markdown file
 ```
 Or, alternatively, you can modify the variables in the script manualy