--- a/dns.rst	Sun Nov 12 13:52:54 2017 +0200
+++ b/dns.rst	Wed Nov 15 11:17:24 2017 +0200
@@ -46,13 +46,19 @@
   $ dig @8.8.8.8 A defun.work
   $ dig +nocmd +noall +answer defun.work
 
-Host name from IP.
-==================
+Host name from IP
+=================
 
 If that information available::
 
   $ nslookup -type=ptr 8.8.8.8
+  $ dig @8.8.8.8 -x 8.8.4.4
 
+  $ dig +noall +answer @8.8.8.8 PTR 4.4.8.8.in-addr.arpa
+  4.4.8.8.in-addr.arpa.   21599   IN      PTR     google-public-dns-b.google.com.
+
+  $ host 8.8.4.4
+  4.4.8.8.in-addr.arpa domain name pointer google-public-dns-b.google.com.
 
 List authoritative NS for domain.
 =================================