diff --git a/docs/simplesamlphp-reference-idp-remote.md b/docs/simplesamlphp-reference-idp-remote.md
index 89526fdfdea27bad7f6f260bd733681ce05139b6..cfa993104526ef1865ab9297b6fed033965a9182 100644
--- a/docs/simplesamlphp-reference-idp-remote.md
+++ b/docs/simplesamlphp-reference-idp-remote.md
@@ -120,6 +120,9 @@ The following SAML 2.0 options are available:
 `hide.from.discovery`
 :   Whether to hide hide this IdP from the local discovery or not. Set to true to hide it. Defaults to false.
 
+`IDPList`
+:   The IdP is allowed to respond to an `AuthNRequest` originally sent to entityIDs in this list.
+
 `nameid.encryption`
 :   Whether NameIDs sent to this IdP should be encrypted. The default
     value is `FALSE`.