Update arguments.md

Add clarity to --monitor-only, information on alternative timezone setting method.

docs/arguments.md

@@ -39,7 +39,7 @@ Environment Variable: N/A
 
 ## Time Zone
 Sets the time zone to be used by WatchTower's logs and the optional Cron scheduling argument (--schedule). If this environment variable is not set, Watchtower will use the default time zone: UTC.
-To find out the right value, see [this list](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones), find your location and use the value in _TZ Database Name_, e.g _Europe/Rome_.
+To find out the right value, see [this list](https://en.wikipedia.org/wiki/List_of_tz_database_time_zones), find your location and use the value in _TZ Database Name_, e.g _Europe/Rome_. The timezome can alternatively be set by volume mounting your hosts /etc/timezone file. `-v /etc/timezone:/etc/timezone:ro`
 
 ```
             Argument: N/A
@@ -139,7 +139,7 @@ Environment Variable: WATCHTOWER_LABEL_ENABLE
 ```   
 
 ## Without updating containers
-Will only monitor for new images, not update the containers.
+Will only monitor for new images, not update the containers. Please note: Due to Docker API limitations the latest image will still be pulled from the registry.
 
 ```
             Argument: --monitor-only