diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 928bd71f4..965d1a80a 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -22,6 +22,10 @@ the most useful contribution.
    hash differs from the one already held under its name goes to that folder's
    `.variants/`.
 
+A ZIP that no list declares as a whole is read file by file, and the report
+says which of them the collection already holds: upload the files
+themselves, unzipped.
+
 From a clone, the file goes to `bios/Manufacturer/Console/filename`, and
 `python scripts/validate_pr.py path/to/file` names that folder for a file still
 outside `bios/`, and `--place` copies it there under its declared name. Given a
diff --git a/scripts/generate_readme.py b/scripts/generate_readme.py
index 5418e4889..0a9d8e6d8 100644
--- a/scripts/generate_readme.py
+++ b/scripts/generate_readme.py
@@ -941,6 +941,10 @@ the most useful contribution.
    hash differs from the one already held under its name goes to that folder's
    `.variants/`.
 
+A ZIP that no list declares as a whole is read file by file, and the report
+says which of them the collection already holds: upload the files
+themselves, unzipped.
+
 From a clone, the file goes to `bios/Manufacturer/Console/filename`, and
 `python scripts/validate_pr.py path/to/file` names that folder for a file still
 outside `bios/`, and `--place` copies it there under its declared name. Given a