diff --git a/Dockerfile b/Dockerfile
index f5c5bfa..e3370f4 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -12,6 +12,7 @@ COPY . .
 
 # Build the application for the specified target architecture
 # https://www.docker.com/blog/faster-multi-platform-builds-dockerfile-cross-compilation-guide/
+# Declare TARGETOS and TARGETARCH in the local scope so they can be used in the build stage.
 ARG TARGETOS TARGETARCH
 RUN CGO_ENABLED=0 GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build -o opendtu-logger .