diff --git a/source/_lovelace/iframe.markdown b/source/_lovelace/iframe.markdown
index 0e34633d2ff..b8106d545bf 100644
--- a/source/_lovelace/iframe.markdown
+++ b/source/_lovelace/iframe.markdown
@@ -44,6 +44,8 @@ title:
   default: none
 {% endconfiguration %}
 
+**Reminder**: you can't mix https and http content. So if your Home Assistant instance is accessed thru https, you won't be able to display http content in the iframe card.
+
 ## {% linkable_title Examples %}
 
 ```yaml