Update Servers/Containerization/Docker/Compose/Speedtest Tracker.md

Servers/Containerization/Docker/Compose/Speedtest Tracker.md

@@ -19,9 +19,9 @@ services:
             - ASSET_URL=${PUBLIC_FQDN}
             - APP_TIMEZONE=${TIMEZONE}
             - DISPLAY_TIMEZONE=${TIMEZONE}
-            - SPEEDTEST_SCHEDULE=*/15 * * * *
+            - SPEEDTEST_SCHEDULE=*/15 * * * * # (1)
             - SPEEDTEST_SERVERS=5858
-            - APP_KEY=${BASE64_APPKEY} # (1)
+            - APP_KEY=${BASE64_APPKEY} # (2)
             - DB_CONNECTION=pgsql
             - DB_HOST=db
             - DB_PORT=5432
@@ -63,7 +63,9 @@ networks:
     external: true
 ```
 
-1.  You can generate a secure appkey with the following command: `echo -n 'base64:'; openssl rand -base64 32;` > Copy this key including the base64: prefix and paste it as your APP_KEY environment variable value.
+1.  You can use [Crontab Guru](https://crontab.guru) to generate a cron expression to schedule automatic speedtests.  e.g. `*/15 * * * *` runs a speedtest every 15 minutes.
+
+2.  You can generate a secure appkey with the following command: `echo -n 'base64:'; openssl rand -base64 32;` > Copy this key including the `base64:` prefix and paste it as your APP_KEY environment variable value.
 
 ```yaml title=".env"
 DB_PASSWORD=SecurePassword