diff --git a/DeepWhite.md b/DeepWhite.md
index 6c397c8..3d4e618 100644
--- a/DeepWhite.md
+++ b/DeepWhite.md
@@ -66,3 +66,4 @@ Generate a custom whitelist on Windows (note: this is optional):
 ```
 PS C:\> Get-ChildItem c:\windows\system32 -Include '*.exe','*.dll','*.sys','*.com' -Recurse | Get-FileHash| Export-Csv -Path whitelist.csv
 ```
+Note: this will generate (harmless) 'PermissionDenied' warnings for locked files, etc. They may be ignored.