add mention of the blog article to be able to use scripts correclty (need haproxy configuration)

README.md

@@ -2,6 +2,10 @@
 
 Some scripts to create and renew all your certificates, and concatenate fullchain and privkey so haproxy is able to use it
 
+**For this to work, you should have configured haproxy to accept let's encrypt connection**  
+More information [here](http://blog.victor-hery.com/index.php?article23/use-haproxy-with-let-s-encrypt)
+([French version](http://blog.victor-hery.com/index.php?article22/utiliser-let-s-encrypt-avec-haproxy)
+
 ## How to create certificate
 Create a certificate with let's encrypt, then concatenate fullchain.pem and privkey.pem, then store the certificate in haproxy given path.