lib/PublicInbox/IdxStack.pm | 2 +-

diff --git a/lib/PublicInbox/IdxStack.pm b/lib/PublicInbox/IdxStack.pm
index b43b8064e5e2717e41d229193a83db117ab27e6a..ce75b46afe99604ec2542bb01634a1f7628c2ea8 100644
--- a/lib/PublicInbox/IdxStack.pm
+++ b/lib/PublicInbox/IdxStack.pm
@@ -14,7 +14,7 @@ 	open(my $io, '+>', undef) or die "open: $!";
 	bless { wr => $io, latest_cmt => $_[1] }, __PACKAGE__
 }
 
-# file_char = [a|m]
+# file_char = [d|m]
 sub push_rec {
 	my ($self, $file_char, $at, $ct, $blob_oid) = @_;
 	my $rec = pack(FMT, $file_char, $at, $ct, $blob_oid);