lib/PublicInbox/View.pm | 4 +++-

diff --git a/lib/PublicInbox/View.pm b/lib/PublicInbox/View.pm
index 15d846a635425dc66c7b2ffe37cd11a1e24e7453..a3a955b2b520515340e57f4bee289cad4ab147f6 100644
--- a/lib/PublicInbox/View.pm
+++ b/lib/PublicInbox/View.pm
@@ -817,7 +817,9 @@ 		$subj = $state->{srch}->subject_normalized($subj);
 		$topic = $subj;
 
 		# kill "[PATCH v2]" etc. for summarization
-		$topic =~ s/\A\s*\[[^\]]+\]\s*//g;
+		unless ($level == 0) {
+			$topic =~ s/\A\s*\[[^\]]+\]\s*//g;
+		}
 		$topic = substr($topic, 0, 30);
 
 		if (++$state->{subjs}->{$topic} == 1) {