diff --git a/README.md b/README.md
index 8c9f666..df0b5eb 100644
--- a/README.md
+++ b/README.md
@@ -61,7 +61,10 @@ PHPUnit via Composer script:
 composer run-script test
 ```
 
-Latest results of cross-platform core testing:
+**Note**: only the latest version of Laravel and its "past-compatible versions" (i.e., past versions with a compatible `artisan` file) are tested to simplify `artisan` mocking.
+This should not cause test incompleteness because the Laravel framework API is very likely compatible across versions.
+
+Latest cross-platform testing results:
 |Runtime|Ubuntu|Windows|
 |---|---|---|
 |Laravel 10 (PHP 8.1)|[![Build-U-L10-PHP80100][build-u-l10-php80100-image]][build-u-l10-php80100-url]|[![Build-W-L10-PHP80100][build-w-l10-php80100-image]][build-u-l10-php80100-url]|