diff --git a/Dockerfile b/Dockerfile
index d8ca90f..535e277 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -1,3 +1,5 @@
+# syntax=docker/dockerfile:1
+
 FROM ghcr.io/linuxserver/baseimage-alpine:3.16
 
 ARG UNRAR_VERSION=6.1.7
diff --git a/Dockerfile.aarch64 b/Dockerfile.aarch64
index f7fdd38..48f5242 100644
--- a/Dockerfile.aarch64
+++ b/Dockerfile.aarch64
@@ -1,3 +1,5 @@
+# syntax=docker/dockerfile:1
+
 FROM ghcr.io/linuxserver/baseimage-alpine:arm64v8-3.16
 
 ARG UNRAR_VERSION=6.1.7
diff --git a/Dockerfile.armhf b/Dockerfile.armhf
index 9506b94..ef4dc60 100644
--- a/Dockerfile.armhf
+++ b/Dockerfile.armhf
@@ -1,3 +1,5 @@
+# syntax=docker/dockerfile:1
+
 FROM ghcr.io/linuxserver/baseimage-alpine:arm32v7-3.16
 
 ARG UNRAR_VERSION=6.1.7