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@@ -8,4 +8,12 @@ Script <path-to-cgi-script>
 	Environment
 		HTTP_HOST <hostname>
 		ENV_KEY <some-env-value>
-```
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+```
+
+Sets the following environmental variables for the CGI script, many following [RFC 3875][rfc]:
+- **`GATEWAY_INTERFACE`** to the fixed value `CGI/1.1`
+- **`PATH_INFO`** to the HTTP path the client requested
+- **`QUERY_STRING`** to the query part of the URI
+- **`REQUEST_METHOD`** to the HTTP request method
+
+[rfc]: https://datatracker.ietf.org/doc/html/rfc3875
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