diff --git a/README.md b/README.md
index 377e1b9ef38e4085c41e14491c63b54db8490142..3d627133a9e4fcdcad66129e0a0f9d1f7df6869d 100644
--- a/README.md
+++ b/README.md
@@ -37,7 +37,7 @@ The SAML backend endpoints are available under the path `/saml`.
 ## SAML service provider metadata
 
 The SAML service provider metadata can be generated with the following command:
-`pipenv run satosa-saml-metadata proxy_conf.yml ssl/<tls-key-file> ssl/<tls-cert-file>`
+`pipenv run satosa-saml-metadata proxy_conf.yaml ssl/<tls-key-file> ssl/<tls-cert-file>`
 
 If the operation was successful, then the generated should be stored in `backend.xml`.