diff --git a/tests/Console/Command/DiffTest.php b/tests/Console/Command/DiffTest.php
index a5448533d..89e0ed992 100644
--- a/tests/Console/Command/DiffTest.php
+++ b/tests/Console/Command/DiffTest.php
@@ -769,6 +769,7 @@ public static function GNUDiffPharsProvider(): iterable
 
                      // Comparing the two archives contents (gnu diff)...
 
+                    Common subdirectories: simple-phar-bar.phar/.phar and simple-phar-baz.phar/.phar
                     diff '--exclude=.phar_meta.json' simple-phar-bar.phar/bar.php simple-phar-baz.phar/bar.php
                     3c3
                     < echo "Hello world!";