diff --git a/docker-compose.yml b/docker-compose.yml
index 659a105d..305d91bd 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -7,6 +7,7 @@ services:
     domainname: ${DOMAINNAME}
     container_name: ${CONTAINER_NAME}
     env_file: mailserver.env
+    # To avoid conflicts with yaml base-60 float, DO NOT remove the quotation marks.
     ports:
       - "25:25"
       - "143:143"