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-rw-r--r--lib/PublicInbox/Smsg.pm2
1 files changed, 2 insertions, 0 deletions
diff --git a/lib/PublicInbox/Smsg.pm b/lib/PublicInbox/Smsg.pm
index da8ce590..fb28eff7 100644
--- a/lib/PublicInbox/Smsg.pm
+++ b/lib/PublicInbox/Smsg.pm
@@ -145,6 +145,8 @@ sub internaldate { # for IMAP
 
 our $REPLY_RE = qr/^re:\s+/i;
 
+# TODO: see RFC 5256 sec 2.1 "Base Subject" and evaluate compatibility
+# w/ existing indices...
 sub subject_normalized ($) {
         my ($subj) = @_;
         $subj =~ s/\A\s+//s; # no leading space