diff --git a/source/_components/panel_iframe.markdown b/source/_components/panel_iframe.markdown
index b10cfa9690e..c02c9738126 100644
--- a/source/_components/panel_iframe.markdown
+++ b/source/_components/panel_iframe.markdown
@@ -15,6 +15,8 @@ ha_release: 0.25
 
 The `panel_iframe` support allows you to add additional panels to your Home Assistant frontend. The panels are listed in the sidebar and can contain external resources like the web frontend of your router, your monitoring system, or your media server.
 
+**Note:** If you are accessing home Assistant over HTTPS using SSL, you cannot access HTTP sites through an iframe panel.
+
 To enable Panel iFrames in your installation, add the following to your `configuration.yaml` file:
 
 ```yaml