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-rw-r--r--lib/PublicInbox/SearchMsg.pm4
1 files changed, 4 insertions, 0 deletions
diff --git a/lib/PublicInbox/SearchMsg.pm b/lib/PublicInbox/SearchMsg.pm
index e314fed1..e55d4019 100644
--- a/lib/PublicInbox/SearchMsg.pm
+++ b/lib/PublicInbox/SearchMsg.pm
@@ -41,8 +41,12 @@ sub load_from_data ($$) {
         $self->{subject} = $subj;
         $self->{from} = $from;
         $self->{references} = $refs;
+
+        # To: and Cc: are stored to optimize HDR/XHDR in NNTP since
+        # some NNTP clients will use that for message displays.
         $self->{to} = $to;
         $self->{cc} = $cc;
+
         $self->{blob} = $blob;
         $self->{mid} = $mid0;
 }