lib/PublicInbox/Feed.pm | 2 +-

diff --git a/lib/PublicInbox/Feed.pm b/lib/PublicInbox/Feed.pm
index 3b2b7af9c9f1e26c4e4390341f3b3516da1c5125..a8578e760fdf8cc002e8ad53d9a008879ee4bff0 100644
--- a/lib/PublicInbox/Feed.pm
+++ b/lib/PublicInbox/Feed.pm
@@ -156,7 +156,7 @@ 	my $first;
 
 	my $pid = open(my $log, '-|', @cmd) or
 		die('open `'.join(' ', @cmd) . " pipe failed: $!\n");
-	my %deleted;
+	my %deleted; # only an optimization at this point
 	my $last;
 	my $nr = 0;
 	my @commits = ();