diff --git a/windows1809/base/Dockerfile b/windows1809/base/Dockerfile
index 99a521c4a6eb90f5d147c66e990c826694b2ef08..2afe70155546dba2b7856b28817cf81261e770e2 100644
--- a/windows1809/base/Dockerfile
+++ b/windows1809/base/Dockerfile
@@ -1,3 +1,5 @@
+# SPDX-License-Identifier: MIT
+
 FROM microsoft/dotnet-framework:3.5-runtime-windowsservercore-ltsc2019
 
 SHELL ["powershell", "-NoProfile", "-ExecutionPolicy Bypass", "-Command", "$ErrorActionPreference = 'Stop';"]