diff --git a/scheme/httpd/response.scm b/scheme/httpd/response.scm
index 80903ce..4fa7873 100644
--- a/scheme/httpd/response.scm
+++ b/scheme/httpd/response.scm
@@ -8,12 +8,18 @@
 (define-record-type http-response :http-response
   (make-response code message seconds mime extras body)
   response?
-  (code response-code)
-  (message response-message)
-  (seconds response-seconds)
-  (mime response-mime)
-  (extras response-extras)
-  (body response-body))
+  (code response-code) ;;HTTP status code
+  (message response-message);;reason phrase: textual description of
+			    ;;status-code, or #f (-> server sends
+			    ;;default reason phrase)
+  (seconds response-seconds);;time the content was created
+  (mime response-mime);;string indicating the MIME type of the response
+  (extras response-extras);;assoc list with extra headers to be
+			  ;;added to the response; its elements are
+			  ;;pairs, each of which consists of a symbol
+			  ;;representing the field name and a string
+			  ;;representing the field value.
+  (body response-body));; message-body
 
 ;; This is mainly for nph-... CGI scripts.
 ;; This means that the body will output the entire MIME message, not