update

watchtower/readme.md

@@ -11,6 +11,14 @@ Automatic updates of containers.
 * [Github](https://github.com/containrrr/watchtower)
 * [DockerHub image used](https://hub.docker.com/r/containrrr/watchtower)
 
+Watchtower is an application that will monitor the running Docker containers
+and watch for changes to the images that those containers
+were originally started from. If watchtower detects that an image has changed,
+it will automatically restart the container using the new image.
+
+As of now, Watchtower needs to always pull images to know if they changed.
+This can be bandwidth intensive, so its scheduled checks should account for this.
+
 # Files and directory structure
 
 ```
@@ -18,12 +26,18 @@ Automatic updates of containers.
 └── ~/
     └── docker/
         └── watchtower/
-            └── 🗋 docker-compose.yml
+            ├── .env
+            └── docker-compose.yml
 ```
 
+* `.env` - a file containing environmental variables for docker compose
+* `docker-compose.yml` - a docker compose file, telling docker how to build the containers
+
+Only these two files must be provided.
+
 # docker-compose
 
-Scheduled to run every saturday at midnight</br>
+Scheduled to run every saturday at midnight using environmental variable.</br>
 Heads up that not a typical cron format is used,
 [seconds are the first digit](https://pkg.go.dev/github.com/robfig/cron@v1.2.0?tab=doc#hdr-CRON_Expression_Format).