diff --git a/README.md b/README.md
index 7251b85..a43e82f 100644
--- a/README.md
+++ b/README.md
@@ -19,5 +19,5 @@ services:
       - ./www:/data/www
       - ./ssh:/ssh # add authorized_keys file here
     environment:
-      PHP: php84 # none, php82, php83, php84
+      PHP: php84 # none (default), php82, php83, php84
 ```
diff --git a/docker-compose-sample.yaml b/docker-compose-sample.yaml
index 6976026..b5b86e6 100644
--- a/docker-compose-sample.yaml
+++ b/docker-compose-sample.yaml
@@ -8,4 +8,4 @@ services:
       - ./www:/data/www
       - ./ssh:/ssh # add authorized_keys file here
     environment:
-      PHP: php84 # none, php82, php83, php84
+      PHP: php84 # none (default), php82, php83, php84