initial cleanup task
diff --git a/releng.control/ b/releng.control/
index 3270906..bfe521b 100644
--- a/releng.control/
+++ b/releng.control/
@@ -16,6 +16,9 @@
 # set at 10 days, under assumption that before that time, 
 # artifacts will be "saved" elsewhere, if needed.
+# if more cleanup is needed, we should take time, and 
+# existence of more recent builds into account, so we never
+# delete the last existing build (even if "old"). 
 echo "    Removing artifact directories older than $n days";