diff --git a/README.md b/README.md
index 14af637..7ee18bb 100644
--- a/README.md
+++ b/README.md
@@ -120,3 +120,5 @@ docker run --rm -e ODOO_URL=https://myodoo.acme.org \
                 -it \
                 danielberteaud/odoo2carddav odoo2carddav --config /conf.yml
 ```
+
+If you need to use a proxy to reach the dav server, you can add PERL_LWP_ENV_PROXY=1 env var