diff --git a/tests/lib/Session/MemoryTest.php b/tests/lib/Session/MemoryTest.php
index 40977f1f3fb..daa79bb1c85 100644
--- a/tests/lib/Session/MemoryTest.php
+++ b/tests/lib/Session/MemoryTest.php
@@ -11,6 +11,10 @@ namespace Test\Session;
 use OC\Session\Memory;
 use OCP\Session\Exceptions\SessionNotAvailableException;
 
+/**
+ * Concrete test case for OC\Session\Memory (in-memory session storage).
+ * Reuses session contract tests and adds in-memory specific assertions.
+ */
 class MemoryTest extends Session {
 	protected function setUp(): void {
 		parent::setUp();