vyx: update README to specify OpenAI API key prereq

kevherro · Apr 8, 2023 · f76ac08 · f76ac08
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commit f76ac08
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diff --git a/README.md b/README.md
@@ -10,6 +10,8 @@ Prerequisites:
   Follow [these instructions](http://golang.org/doc/code.html) to prepare
   the environment.
 
+- OpenAI API key. Set it as an environment variable named `OPENAI_API_KEY`.
+
 To build and install it:
 
     go install github.com/kevherro/vyx@latest