diff --git a/docs/web/basics/offerings.mdx b/docs/web/basics/offerings.mdx
index 57192f66f..47b9e1758 100644
--- a/docs/web/basics/offerings.mdx
+++ b/docs/web/basics/offerings.mdx
@@ -28,7 +28,13 @@ Every page stays in the same navigation, whichever offering you use.
 
 ## Feature availability {#availability}
 
-These are the pages that declare where they apply.
+These are the pages that state where they apply, grouped as in the navigation.
+**Yes** means an offering has what the page describes and **No** that it does
+not; **Varies** means it depends on the version or configuration of a
+deployment, and the summary says on what. The list is not every feature:
+pages that span several, such as overviews and tutorials, are left out, and the
+[SQL](/basics/sql) row stands for the SQL reference, whose pages each say where
+they run.
 
 {/* availability-comparison */}