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diff --git a/README.md b/README.md
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 ## Usage
 
-1. Put your API key in your *config.exs* file.
+1. Put your API key in your *config.exs* file:
+
+```elixir
+config :mailchimp,
+apikey: "your api-us10"
+```
 
 2. Start a new process: