diff --git a/index.bs b/index.bs
index 9b67255..52121e5 100644
--- a/index.bs
+++ b/index.bs
@@ -1162,6 +1162,12 @@ partial interface HTMLIFrameElement {
     1. Let |report-only result| be the result of calling <a abstract-op>Check
        permissions policy</a>, given |report-only policy|, |feature|, |origin|,
        and |document|'s [=Document/origin=].
+    1. Optionally, set |result| to "<code>Disabled</code>" if the user agent deems it necessary.
+
+       Note: The user agent may wish to disallow particular contexts or scripts from using the 
+       API. See the <a 
+       href="https://github.com/explainers-by-googlers/selective-permissions-intervention">
+       Selective Permissions Intervention</a> as an example.
     1. If |report| is True:
         1. Let |settings| be |document|'s <a>environment settings object</a>.
         1. If |result| is "<code>Disabled</code>":