diff --git a/content/components/captive_portal.md b/content/components/captive_portal.md
index c54fa1aa5b..a6c5a51f7c 100644
--- a/content/components/captive_portal.md
+++ b/content/components/captive_portal.md
@@ -35,7 +35,9 @@ wifi:
 captive_portal:
 ```
 
-No configuration variables.
+## Configuration variables
+
+- **custom_html_file** (*Optional*, local file): Path to local file to be used as alternative captive portal index page.
 
 ## See Also