TODO on If-Modified-Since
diff --git a/lib/shelf_static.dart b/lib/shelf_static.dart
index 7f8bf2d..6ef0af8 100644
--- a/lib/shelf_static.dart
+++ b/lib/shelf_static.dart
@@ -12,6 +12,8 @@
 // mime type handling
 // hidden files
 
+// If-Modified-Since on request
+
 Handler getHandler(String fileSystemPath) {
   var rootDir = new Directory(fileSystemPath);
   fileSystemPath = rootDir.resolveSymbolicLinksSync();