diff --git a/pdnsd/README.md b/pdnsd/README.md
index 5649adc..8eb3b91 100644
--- a/pdnsd/README.md
+++ b/pdnsd/README.md
@@ -1,6 +1,8 @@
 pdnsd
 =====
 
+[![](https://badge.imagelayers.io/vimagick/pdnsd:latest.svg)](https://imagelayers.io/?images=vimagick/pdnsd:latest)
+
 `pdnsd` is a proxy DNS server with permanent caching (the cache contents are
 written to hard disk on exit) that is designed to cope with unreachable or down
 DNS servers (for example in dial-in networking).
@@ -21,3 +23,17 @@ pdnsd:
 ```
 
 > Uncomment `volumes` to use customized config file.
+
+## server
+
+```
+$ cd ~/fig/pdnsd/
+$ docker-compose up -d
+$ docker exec pdnsd_pdnsd_1 pdnsd-ctl status
+```
+
+## client
+
+```
+$ dig @1.2.3.4 www.youtube.com
+```