diff --git a/doc/sources/nghttpx-howto.rst b/doc/sources/nghttpx-howto.rst
index 40c74e68..11d3eb0b 100644
--- a/doc/sources/nghttpx-howto.rst
+++ b/doc/sources/nghttpx-howto.rst
@@ -498,6 +498,14 @@ naming scheme and structure, nghttpx provides the new option
 :option:`--tls13-ciphers` and :option:`--tls13-client-ciphers` to
 change preferred cipher list for TLSv1.3.
 
+WebSockets over HTTP/2
+----------------------
+
+nghttpx supports `RFC 8441 <https://tools.ietf.org/html/rfc8441>`_
+Bootstrapping WebSockets with HTTP/2 for both frontend and backend
+connections.  This feature is enabled by default and no configuration
+is required.
+
 Migration from nghttpx v1.18.x or earlier
 -----------------------------------------