diff --git a/README.md b/README.md
index 7d33170..8a2738a 100644
--- a/README.md
+++ b/README.md
@@ -5,15 +5,77 @@ Update dynamic DNS records from netlink.
 
 The set of active interface IPv4/IPv6 addresses is used to send DNS `UPDATE` requests to the primary NS for a DNS zone.
 
+The DNS update requests are retried in the background (XXX: currently blocks for 10s on each query attempt).
+
 ## Install
 
     go get -v github.com/qmsk/go-nsupdate
 
 ## Usage
 
-    TSIG_SECRET=... go-nsupdate --interface=vlan-wan --tsig-algorithm=hmac-sha256 yzzrt.dyn.qmsk.net --watch
     
     # Using a generated TSIG key:
     # TSIG_SECRET=$(python -c 'import os; print os.urandom(32).encode("base64")')
+    
+    TSIG_SECRET=... go-nsupdate --interface=vlan-wan --tsig-algorithm=hmac-sha256 yzzrt.dyn.qmsk.net --watch
+    2016/06/19 21:29:33 discover server=zovoweix.qmsk.net.
+    2016/06/19 21:29:33 using TSIG: yzzrt.dyn.qmsk.net (algo=hmac-sha256.)
+    2016/06/19 21:29:33 AddrSet iface=vlan-wan: up 2001:14ba:400:0:7:1449:a833:f11f
+    2016/06/19 21:29:33 update...
+    2016/06/19 21:29:33 update query:
+    ;; opcode: UPDATE, status: NOERROR, id: 61616
+    ;; flags:; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 1
 
+    ;; QUESTION SECTION:
+    ;dyn.qmsk.net.  IN       SOA
+
+    ;; AUTHORITY SECTION:
+    yzzrt.dyn.qmsk.net.     0       ANY     ANY
+    yzzrt.dyn.qmsk.net.     60      IN      AAAA    2001:14ba:400:0:7:1449:a833:f11f
+
+    ;; ADDITIONAL SECTION:
+
+    ;; TSIG PSEUDOSECTION:
+    yzzrt.dyn.qmsk.net.     0       ANY     TSIG     hmac-sha256. 20160619182933 300 0  61616 0 0 
+    2016/06/19 21:29:33 update answer:
+    ;; opcode: UPDATE, status: NOERROR, id: 61616
+    ;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
+
+    ;; QUESTION SECTION:
+    ;dyn.qmsk.net.  IN       SOA
+
+    ;; ADDITIONAL SECTION:
+
+    ;; TSIG PSEUDOSECTION:
+    yzzrt.dyn.qmsk.net.     0       ANY     TSIG     hmac-sha256. 20160619182933 300 32 E083433B2893B2036B24549E3537C6E17B858019B9862DC2EB9EDFB959D03232 61616 0 0 
+    2016/06/19 21:46:34 AddrSet iface=vlan-wan: up 213.243.178.191
+    2016/06/19 21:46:34 addrs update...
+    2016/06/19 21:46:34 update...
+    2016/06/19 21:46:34 update query:
+    ;; opcode: UPDATE, status: NOERROR, id: 30973
+    ;; flags:; QUERY: 1, ANSWER: 0, AUTHORITY: 3, ADDITIONAL: 1
+
+    ;; QUESTION SECTION:
+    ;dyn.qmsk.net.  IN       SOA
+
+    ;; AUTHORITY SECTION:
+    yzzrt.dyn.qmsk.net.     0       ANY     ANY
+    yzzrt.dyn.qmsk.net.     60      IN      AAAA    2001:14ba:400:0:7:1449:a833:f11f
+    yzzrt.dyn.qmsk.net.     60      IN      A       213.243.178.191
+
+    ;; ADDITIONAL SECTION:
+
+    ;; TSIG PSEUDOSECTION:
+    yzzrt.dyn.qmsk.net.     0       ANY     TSIG     hmac-sha256. 20160619184634 300 0  30973 0 0 
+    2016/06/19 21:46:35 update answer:
+    ;; opcode: UPDATE, status: NOERROR, id: 30973
+    ;; flags: qr; QUERY: 1, ANSWER: 0, AUTHORITY: 0, ADDITIONAL: 1
+
+    ;; QUESTION SECTION:
+    ;dyn.qmsk.net.  IN       SOA
+
+    ;; ADDITIONAL SECTION:
+
+    ;; TSIG PSEUDOSECTION:
+    yzzrt.dyn.qmsk.net.     0       ANY     TSIG     hmac-sha256. 20160619184635 300 32 1F7F1EB8A3D5213EAAA163AE78388D48911495A0F3E2870688F3338160905EC9 30973 0