diff --git a/preinstall b/preinstall
index f280c74..8e7638f 100755
--- a/preinstall
+++ b/preinstall
@@ -1,5 +1,7 @@
 #!/bin/bash
 
+# this script should be run when instructed to.
+
 export DEBIAN_FRONTEND=noninteractive
 export APT_LISTCHANGES_FRONTEND=none
 export LANG=C.UTF-8