diff --git a/doc/nghttpx.h2r b/doc/nghttpx.h2r
index 70cbeb88..74565e7e 100644
--- a/doc/nghttpx.h2r
+++ b/doc/nghttpx.h2r
@@ -543,9 +543,9 @@ connections or requests.  It also avoids any process creation as is
 the case with hot swapping with signals.
 
 The one limitation is that only numeric IP address is allowd in
-:option:`backend <--backend>` in request body while non numeric
-hostname is allowed in command-line or configuration file is read
-using :option:`--conf`.
+:option:`backend <--backend>` in request body unless "dns" parameter
+is used while non numeric hostname is allowed in command-line or
+configuration file is read using :option:`--conf`.
 
 SEE ALSO
 --------