diff --git a/lib/shelf_static.dart b/lib/shelf_static.dart
index dc22e83..f50c8b2 100644
--- a/lib/shelf_static.dart
+++ b/lib/shelf_static.dart
@@ -27,6 +27,7 @@
 
     var resolvedPath = file.resolveSymbolicLinksSync();
 
+    // Do not serve a file outside of the original fileSystemPath
     if (!p.isWithin(rootPath, resolvedPath)) {
       throw 'Requested path ${request.pathInfo} resolved to $resolvedPath '
           'is not under $rootPath.';