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@@ -16,4 +16,10 @@ Sets the following environmental variables for the CGI script, many following [R
 - **`QUERY_STRING`** to the query part of the URI
 - **`REQUEST_METHOD`** to the HTTP request method
 
+Additionally, corgi will set environment variables for the HTTP request headers.
+They will be uppercased and hyphens replaced with underscores.
+
+Any environmental variable may be overridden if it is set in the
+configuration file.
+
 [rfc]: https://datatracker.ietf.org/doc/html/rfc3875
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