diff --git a/README.md b/README.md
index 4d9fd66..d3f31d7 100644
--- a/README.md
+++ b/README.md
@@ -6,6 +6,15 @@ Some scripts to create and renew all your certificates, and concatenate fullchai
 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)
 
+## Prerequisites
+
+You need to install certbot according to your distribution :
+
+For debian : 
+```
+apt-get install certbot
+```
+
 ## 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.
 
diff --git a/create-certificat b/create-certificat
index a08818a..73b3f2c 100755
--- a/create-certificat
+++ b/create-certificat
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 #Configuration variables
-certbot_bin="/root/letsencrypt/certbot-auto"
+certbot_bin="/usr/local/bin/certbot"
 haproxy_pem_path="/etc/haproxy/cert"
 
 
diff --git a/renew-certificates b/renew-certificates
index 9f9975a..5e8b707 100755
--- a/renew-certificates
+++ b/renew-certificates
@@ -1,7 +1,7 @@
 #!/bin/bash
 
 #Configuration variables
-certbot_bin="/root/letsencrypt/certbot-auto"
+certbot_bin="/usr/local/bin/certbot"
 haproxy_pem_path="/etc/haproxy/cert"
 
 #Renew all certificates that needed it