diff --git a/README.rst b/README.rst
index 93879b8..7d24271 100644
--- a/README.rst
+++ b/README.rst
@@ -18,6 +18,7 @@
         encryption: "false"
       idp_url: "https://saml.example.com/oam/fed"
       idp_metadata_url: "https://saml.example.com/oamfed/idp/metadata"
+      idp_metadata_url_reload_interval: 180000 # optional
       attributes:
       - name: test
         id: test