diff --git a/doc/04-schema.md b/doc/04-schema.md
index 969082cba..d36e90eaf 100644
--- a/doc/04-schema.md
+++ b/doc/04-schema.md
@@ -237,6 +237,7 @@ Support information includes the following:
 * **source:** URL to browse or download the sources.
 * **docs:** URL to the documentation.
 * **rss:** URL to the RSS feed.
+* **readme:** Relative path to the readme document.
 
 An example: