diff --git a/README.md b/README.md
index 5905faf..65b3ba5 100644
--- a/README.md
+++ b/README.md
@@ -15,3 +15,11 @@ A shell script used to renew let’s encrypt certificates
 	openssl req -new -sha512 -key ix.bzh.key -subj "/" -reqexts SAN -config < (cat /etc/ssl/openssl.cnf < (printf "[SAN]\nsubjectAltName=DNS:ix.bzh,DNS:www.ix.bzh")) > ix.bzh.csr
 ```
 
+## Example of nginx configuration for the HTTP challenge
+
+```
+	location /.well-known/acme-challenge/ {
+		alias		/usr/local/www/le-challenges/.well-known/acme-challenge/;
+		try_files	$uri $uri/ =404;
+	}
+```