diff --git a/sys/lib/dist/ndb/dnschallenge b/sys/lib/dist/ndb/dnschallenge
new file mode 100644
index 000000000..9cbd2cf4a
--- /dev/null
+++ b/sys/lib/dist/ndb/dnschallenge
@@ -0,0 +1 @@
+# ndb file for acmed(8) to put dns auth challenge responses
diff --git a/sys/lib/dist/ndb/local b/sys/lib/dist/ndb/local
index c904f0016..7c8126ea5 100644
--- a/sys/lib/dist/ndb/local
+++ b/sys/lib/dist/ndb/local
@@ -5,6 +5,7 @@ database=
 	file=/net/ndb
 	file=/lib/ndb/local
 	file=/lib/ndb/common
+	file=/lib/ndb/dnschallenge
 
 #
 #  entries defining the dns root.  these will be overridden by any