diff --git a/lib/README.http2 b/lib/README.http2
index 40f6a650e68e3d3da951d2dd10d72233fdb8e61a..2975a3dbd4bd71f28f97dbdf9ea26c817258663a 100644
--- a/lib/README.http2
+++ b/lib/README.http2
@@ -3,6 +3,13 @@ HTTP2 with libcurl
 
  Spec: http://tools.ietf.org/html/draft-ietf-httpbis-http2-06
 
+ nghttp2 (https://github.com/tatsuhiro-t/nghttp2)
+
+  We're depending on this 3rd party library for the actual low level protocol
+  handling parts. The reason for this is that HTTP2 is much more complex at
+  that layer than HTTP1.1 (which we implement on our own) and that nghttp2 is
+  an already existing and well functional library.
+
  Over an http:// URL
 
   If CURLOPT_HTTP_VERSION is set to CURL_HTTP_VERSION_2, libcurl will include