diff --git a/doc/sources/nghttpx-howto.rst b/doc/sources/nghttpx-howto.rst
index dcd3582b..f2aac9e7 100644
--- a/doc/sources/nghttpx-howto.rst
+++ b/doc/sources/nghttpx-howto.rst
@@ -1,5 +1,5 @@
-nghttpx - HOW-TO
-================
+nghttpx - HTTP/2 proxy - HOW-TO
+===============================
 
 nghttpx is a proxy translating protocols between HTTP/2 and other
 protocols (e.g., HTTP/1, SPDY).  It operates in several modes and each