diff --git a/packages/file/lib/src/backends/memory/node.dart b/packages/file/lib/src/backends/memory/node.dart
index 68c4cc9..cc4ba14 100644
--- a/packages/file/lib/src/backends/memory/node.dart
+++ b/packages/file/lib/src/backends/memory/node.dart
@@ -153,6 +153,7 @@
     accessed = now;
   }
 
+  /// See [NodeBasedFileSystem.clock].
   Clock get clock => parent.clock;
 
   /// Last changed time in milliseconds since the Epoch.