diff --git a/sys/cddl/dev/prototype.c b/sys/cddl/dev/prototype.c
--- a/sys/cddl/dev/prototype.c
+++ b/sys/cddl/dev/prototype.c
@@ -82,7 +82,10 @@
 static void
 prototype_load(void *dummy)
 {
-	/* Create the /dev/dtrace/prototype entry. */
+	/*
+	 * Create the /dev/dtrace/prototype entry.
+	 * XXX: Remove this if the provider does not need any customs ioctls.
+	 */
 	prototype_cdev = make_dev(&prototype_cdevsw, 0, UID_ROOT, GID_WHEEL, 0600,
 	    "dtrace/prototype");