Update README.md

README.md

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 # Initial Configuration
 1. When the sketch runs for the first time, the D1 mini will try to connect to your wifi and fail (because it doesn't have any previously saved wifi credentials). This will cause it to start up an access point, which serves up a captive configuration portal (thanks to [WiFiManager](https://github.com/tzapu/WiFiManager).
 1. You can connect to this access point to select and enter credentials for your network
-1. You will also enter your [ipstack.com](https://ipstack.com/) API key and [Google Time Zone](https://developers.google.com/maps/documentation/timezone/get-api-key) API key on this screen
+1. You will also enter your [ipstack.com](https://ipstack.com/) API key and [Google Time Zone](https://developers.google.com/maps/documentation/timezone/get-api-key)/[Google Maps Javascript](https://developers.google.com/maps/documentation/javascript/get-api-key) API key on this screen
 1. Save (the D1 mini will restart and connect to your wifi)
 
 # Runtime Configuration