diff --git a/README.md b/README.md
index 20c8b93..074ff2c 100644
--- a/README.md
+++ b/README.md
@@ -89,6 +89,20 @@
 - [ ] Your server should never die.
 
 
+---
+## cgi rfc
+[rfc 3875](https://www.rfc-editor.org/rfc/rfc3875)
+
+[server responsabilities](https://www.rfc-editor.org/rfc/rfc3875#section-3.1)
+- The server [...] receives the request from the client
+- selects a CGI script to handle the request
+- converts the client request to a CGI request
+- executes the script and converts the CGI response into a response for the client
+
+[script uri](https://www.rfc-editor.org/rfc/rfc3875#section-3.3)
+- the 'Script-URI' [...] MUST have the property that if the client had accessed this URI instead, then the script would have been executed
+
+
 ---
 ## cgi env variables
 [cgi env variables](http://www.faqs.org/rfcs/rfc3875.html)