diff --git a/src/testdir/test_filechanged.vim b/src/testdir/test_filechanged.vim
index ee9e80b..5dca43f 100644
--- a/src/testdir/test_filechanged.vim
+++ b/src/testdir/test_filechanged.vim
@@ -139,8 +139,7 @@
 
 func Test_FileChangedShell_edit_dialog()
   CheckNotGui
-  " FIXME: why does this not work on MS-Windows?
-  CheckUnix
+  CheckUnix  " Using low level feedkeys() does not work on MS-Windows.
 
   new Xchanged_r
   call setline(1, 'reload this')