+# not documenting m: and mid: for now, the using the URLs works w/o Xapian
+our @HELP = (
+ 's:' => <<EOF,
+match within Subject only e.g. s:"a quick brown fox"
+This is a probabilistic search with support for stemming
+and wildcards '*'
+EOF
+ 'd:' => <<EOF,
+date range as YYYYMMDD e.g. d:19931002..20101002
+Open-ended ranges such as d:19931002.. and d:..20101002
+are also supported.
+EOF
+);
+# TODO: (from mairix, some of these are maybe)
+# b (body), f (From:), c (Cc:), n (attachment), t (To:)
+# tc (To:+Cc:), bs (body + Subject), tcf (To: +Cc: +From:)
+#
+# Non-mairix:
+# df (filenames from diff)
+# nq (non-quoted body)
+# da (diff a/ removed lines)
+# db (diff b/ added lines)
+