Description: update manpage wrt --extra-clean
Author: Alexander Zangerl <az@debian.org>
--- a/bin/duplicity.1
+++ b/bin/duplicity.1
@@ -510,6 +510,11 @@ section for more information.
 .B --extra-clean
 When cleaning up, be more aggressive about saving space.  For example, this
 may delete signature files for old backup chains.
+
+.B Caution: 
+Without signature files those old backup chains are unrestorable. Do not
+use --extra-clean unless you know what you're doing.
+
 See the
 .B cleanup
 argument for more information.
