diff --git a/tool/builddir/etc/build.conf.optional b/tool/builddir/etc/build.conf.optional
index eb6af7e88..e20385ddb 100644
--- a/tool/builddir/etc/build.conf.optional
+++ b/tool/builddir/etc/build.conf.optional
@@ -31,6 +31,11 @@
 #
 #REPOSITORIES += $(GENODE_DIR)/dde_linux
 
+#
+# NetBSD file-system support
+#
+#REPOSITORIES += $(GENODE_DIR)/dde_rump
+
 #
 # High-level Genode-specific services and applications
 #