diff --git a/doc/OCTOPRINT.md b/doc/OCTOPRINT.md
index ddc9db7..45a4b1d 100644
--- a/doc/OCTOPRINT.md
+++ b/doc/OCTOPRINT.md
@@ -17,7 +17,7 @@ services:
   signal-cli-rest-api:
     image: bbernhard/signal-cli-rest-api:latest
     environment:
-	    - MODE=json-rpc #supported modes: json-rpc, native, normal
+      - MODE=json-rpc #supported modes: json-rpc, native, normal
     ports:
       - "8080:8080" # map docker port 8080 to host port 8080.
     volumes: