diff --git a/README.md b/README.md
index dfbe03c..90e6945 100644
--- a/README.md
+++ b/README.md
@@ -1,2 +1,29 @@
 # jails-configs
-Freebsd jails configs scripts
+A collection of config files in order to easily deploy it on a Freebsd Jail.
+
+## dnsmasq_jail.sh
+
+A simple adblock dns server. Simplified version of [https://vlads.me/post/setting-up-dns-adblocker-freebsd-jail/](https://vlads.me/post/setting-up-dns-adblocker-freebsd-jail/)
+
+**host requisites**
+
+* csh shell (Available by default in FreeBSD)
+
+* wget and diff to compare files if required
+
+	```shell
+	pkg install wget diffutils
+	```
+
+* An empty or existing jail
+	*  	Set jail mount point with JAILMOUNTPOINT variable of dnsmasq_jail.sh script. I don' t know if it would be better to pass mountpoint as an script input arg
+	```Shell
+	set JAILMOUNTPOINT = "/mnt/jails"
+	```
+
+
+**Use it**
+
+Just launch .sh script passing an existing jail name as argument
+`./dnsmasq_jail.sh jailName`
+