diff --git a/docker-compose.yml b/docker-compose.yml
index 26fba8f0a..50d8c546e 100644
--- a/docker-compose.yml
+++ b/docker-compose.yml
@@ -15,6 +15,7 @@ services:
         build:
             context: docker/php
             args:
+                # Set here your timezone using one of this: http://php.net/manual/en/timezones.php
                 timezone: 'Europe/Monaco'
         ports:
             - "9000:9000"
diff --git a/docker/php/Dockerfile b/docker/php/Dockerfile
index b43d40b51..29d27c3a8 100644
--- a/docker/php/Dockerfile
+++ b/docker/php/Dockerfile
@@ -1,5 +1,6 @@
 FROM php:fpm
 
+# Default timezone. To change it, use the argument in the docker-compose.yml file
 ARG timezone='Europe/Paris'
 
 RUN apt-get update && apt-get install -y \