diff --git a/README.md b/README.md
index d2e2254..de5edb1 100644
--- a/README.md
+++ b/README.md
@@ -936,7 +936,8 @@ answer from what did decrypt. The library keeps a list of what it left out, with
 the reason, in `metadata.json`: the next refresh asks the server only for what
 changed, so it would not see the record again. A record stays on that list until
 a later refresh gets a copy that decrypts or learns that the server deleted it.
-`lib.backup()` reports each one (see "Backup layout").
+`lib.backup()` reports each such album, and each such file in its scope that has
+no copy that decrypted (see "Backup layout").
 
 ### Read surface