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-rw-r--r--lib/PublicInbox/Mbox.pm4
1 files changed, 3 insertions, 1 deletions
diff --git a/lib/PublicInbox/Mbox.pm b/lib/PublicInbox/Mbox.pm
index 8837400a..6d902e6c 100644
--- a/lib/PublicInbox/Mbox.pm
+++ b/lib/PublicInbox/Mbox.pm
@@ -125,7 +125,9 @@ sub msg_hdr ($$;$) {
 
 sub msg_body ($) {
         # mboxrd quoting style
-        # ref: http://www.qmail.org/man/man5/mbox.html
+        # https://en.wikipedia.org/wiki/Mbox#Modified_mbox
+        # https://www.loc.gov/preservation/digital/formats/fdd/fdd000385.shtml
+        # https://web.archive.org/http://www.qmail.org/man/man5/mbox.html
         $_[0] =~ s/^(>*From )/>$1/gm;
         $_[0] .= "\n";
 }