diff --git a/contrib/init/sysvinit-debian/docker.default b/contrib/init/sysvinit-debian/docker.default
index 14e660175b..da23c57ce9 100644
--- a/contrib/init/sysvinit-debian/docker.default
+++ b/contrib/init/sysvinit-debian/docker.default
@@ -1,5 +1,12 @@
 # Docker Upstart and SysVinit configuration file
 
+#
+# THIS FILE DOES NOT APPLY TO SYSTEMD
+#
+#   Please see the documentation for "systemd drop-ins":
+#   https://docs.docker.com/engine/articles/systemd/
+#
+
 # Customize location of Docker binary (especially for development testing).
 #DOCKER="/usr/local/bin/docker"