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-rw-r--r--lib/PublicInbox/Search.pm1
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/PublicInbox/Search.pm b/lib/PublicInbox/Search.pm
index f2d3b92d..c54cf7b9 100644
--- a/lib/PublicInbox/Search.pm
+++ b/lib/PublicInbox/Search.pm
@@ -12,6 +12,7 @@ use constant {
         YYYYMMDD => 1, # Date: header for searching in the WWW UI
         DT => 2, # Date: YYYYMMDDHHMMSS
         BYTES => 3, # IMAP RFC822.SIZE
+        UID => 4, # IMAP UID == NNTP article number == Xapian docid
         # TODO
         # REPLYCNT => 4, # IMAP ANSWERED
 };