diff --git a/README.md b/README.md
index c21dbf8..99d1079 100644
--- a/README.md
+++ b/README.md
@@ -16,4 +16,5 @@ services:
     restart: unless-stopped
     environment:
       - TOKEN=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
+      - PREFIX=X
 ```
\ No newline at end of file