diff --git a/types/http.d.ts b/types/http.d.ts
index 3654e3a..ee8a733 100644
--- a/types/http.d.ts
+++ b/types/http.d.ts
@@ -1,10 +1,11 @@
+/**
+ * @see https://tools.ietf.org/html/rfc7231#section-6.1
+ */
 declare const enum HttpCode {
-  // 100
   CONTINUE = 100,
   SWITCHING_PROTOCOLS = 101,
   PROCESSING = 102,
 
-  // 200
   OK = 200,
   CREATED = 201,
   ACCEPTED = 202,
@@ -14,7 +15,6 @@ declare const enum HttpCode {
   PARTIAL_CONTENT = 206,
   MULTI_STATUS = 207,
 
-  // 300
   MULTIPLE_CHOICES = 300,
   MOVED_PERMANENTLY = 301,
   MOVED_TEMPORARILY = 302,
@@ -24,7 +24,6 @@ declare const enum HttpCode {
   TEMPORARY_REDIRECT = 307,
   PERMANENT_REDIRECT = 308,
 
-  // 400
   BAD_REQUEST = 400,
   UNAUTHORIZED = 401,
   PAYMENT_REQUIRED = 402,
@@ -53,7 +52,6 @@ declare const enum HttpCode {
   TOO_MANY_REQUESTS = 429,
   REQUEST_HEADER_FIELDS_TOO_LARGE = 431,
 
-  // 500
   INTERNAL_SERVER_ERROR = 500,
   NOT_IMPLEMENTED = 501,
   BAD_GATEWAY = 502,