diff --git a/templates/etc/default/docker.j2 b/templates/etc/default/docker.j2
index 9d9a36e..59b649c 100644
--- a/templates/etc/default/docker.j2
+++ b/templates/etc/default/docker.j2
@@ -2,11 +2,18 @@
 
 # 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).
 {% if docker_etc_default_binary is defined %}
-DOCKER="{{ docker_etc_default_binary }}"
+DOCKERD="{{ docker_etc_default_binary }}"
 {% else %}
-#DOCKER="/usr/local/bin/docker"
+#DOCKERD="/usr/local/bin/dockerd"
 {% endif %}
 
 # Use DOCKER_OPTS to modify the daemon startup options.