fixup! test: add comment

Author: RaisinTen

test/parallel/test-vfs.js

@@ -39,6 +39,7 @@ common.expectWarning(
 process.on('warning', common.mustCall());
 
 const originalStat = Module._stat;
+TODO(aduh95): We'd like to have a better way to achieve this without monkey-patching.
 Module._stat = function(filename) {
   if (!filename.startsWith(process.execPath)) {
     return originalStat(filename);