Updated README.

philipp-meier · Feb 23, 2023 · e998481 · e998481
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@@ -9,6 +9,7 @@ Simple, neofetch-like command line tool for displaying Guild Wars 2 stats by usi
 **Note:** This is a learning project I set up to familiarize myself with Rust, since I did not have any prior experience with this tech stack. Feel free to contribute to this project.
 
 ## Usage
+Set your GW2 API-key to a environment variable named `Gw2Cli_ApiKey`. After that, gw2-cli can be used as described below:  
 ```bash
 Usage: gw2cli [OPTIONS] [COMMAND]