diff --git a/doc/nghttpx.1 b/doc/nghttpx.1
index dbb89741..16e77c44 100644
--- a/doc/nghttpx.1
+++ b/doc/nghttpx.1
@@ -1971,9 +1971,9 @@ connections or requests.  It also avoids any process creation as is
 the case with hot swapping with signals.
 .sp
 The one limitation is that only numeric IP address is allowd in
-\fI\%backend\fP in request body while non numeric
-hostname is allowed in command\-line or configuration file is read
-using \fI\%\-\-conf\fP\&.
+\fI\%backend\fP in request body unless "dns" parameter
+is used while non numeric hostname is allowed in command\-line or
+configuration file is read using \fI\%\-\-conf\fP\&.
 .SH SEE ALSO
 .sp
 \fBnghttp(1)\fP, \fBnghttpd(1)\fP, \fBh2load(1)\fP
diff --git a/doc/nghttpx.1.rst b/doc/nghttpx.1.rst
index fd7b09c6..4b12e540 100644
--- a/doc/nghttpx.1.rst
+++ b/doc/nghttpx.1.rst
@@ -1803,9 +1803,9 @@ 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
 --------