diff --git a/azure/README.md b/azure/README.md
index 535f758..cf4c09f 100644
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+++ b/azure/README.md
@@ -1,68 +1,74 @@
 SWH azure provisioning
 -------------------------
 
 # Pre-requisite
 
 - az [1]
 - rights in the azure portal [2]
 
 [1] https://docs.microsoft.com/en-us/cli/azure/install-azure-cli-apt?view=azure-cli-latest
 [2] https://portal.azure.com
 
 # Create vm
 
 ``` sh
 $ ./create-vm.sh <name> <type> <location>
 # create a node with name `name` and `type` at `location`
 # ...
 $ ./create-vm.sh worker01 worker euwest
 # creates a node worker01.euwest.azure of type `worker` at location `euwest` (default)
 # ...
 $ ./create-vm.sh dbreplica1 db
 # creates a node webapp0 of type `db` at location euwest
 # ...
 ```
 
 Possible names:
 - worker01
 - webapp0
 - dbreplica0
 
 
 Possible types:
 - db (replica or otherwise)
 - storage (stoarge service)
 - worker (computing nodes)
 - webapp
 
 
 This will:
 - create an azure vm node
 - running the latest debian stable (9 as of this writing)
 - with admin user zack (uid 1000)
 - with a local public key (so that we can connect later on)
 - and continue the provisioning steps
 
 # Provision
 
 ``` sh
 ADMIN_USER=zack
 scp ./provision-vm.sh $ADMIN_USER@<name>:/tmp/
 # check the ip and access the vm
 ssh $ADMIN_USER@<ip>
 $ chmod +x /tmp/provision-vm.sh
 $ sudo /tmp/provision-vm.sh (public|private)
 # ...
 # Use Example:
 # machine destined to be publicly accessible
 $ sudo /tmp/provision-vm.sh public
 # ...
 # machine destined to be only seen through our vpn
 $ sudo /tmp/provision-vm.sh private
 ```
 
+# update DNS server
+
+Trigger a record refresh on the dns server (pergamon)
+
+``` sh
+$ sudo puppet agent --test
 ```
 
 # More documentation
 
 cf. [New machine setup](https://wiki.softwareheritage.org/index.php?title=New_machine_setup)