diff --git a/LICENSE-MIT b/LICENSE-MIT
index 40ebce2..58010b3 100644
--- a/LICENSE-MIT
+++ b/LICENSE-MIT
@@ -1,4 +1,8 @@
-Copyright Joyent, Inc. and other Node contributors. All rights reserved.
+http_parser.c is based on src/http/ngx_http_parse.c from NGINX copyright
+Igor Sysoev.
+
+Additional changes are licensed under the same terms as NGINX and
+copyright Joyent, Inc. and other Node contributors. All rights reserved.
 
 Permission is hereby granted, free of charge, to any person obtaining a copy
 of this software and associated documentation files (the "Software"), to
diff --git a/http_parser.c b/http_parser.c
index 0fe0e8f..5991cef 100644
--- a/http_parser.c
+++ b/http_parser.c
@@ -1,4 +1,7 @@
-/* Copyright Joyent, Inc. and other Node contributors. All rights reserved.
+/* Based on src/http/ngx_http_parse.c from NGINX copyright Igor Sysoev
+ *
+ * Additional changes are licensed under the same terms as NGINX and
+ * copyright Joyent, Inc. and other Node contributors. All rights reserved.
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to