+=head1 SEARCH TERMS
+
+C<lei q> supports the same search prefixes used by HTTP(S) public-inbox
+instances:
+
+=for comment
+AUTO-GENERATED-SEARCH-TERMS-BEGIN
+
+ s: match within Subject e.g. s:"a quick brown fox"
+ d: match date-time range, git "approxidate" formats supported
+ Open-ended ranges such as `d:last.week..' and
+ `d:..2.days.ago' are supported
+ b: match within message body, including text attachments
+ nq: match non-quoted text within message body
+ q: match quoted text within message body
+ n: match filename of attachment(s)
+ t: match within the To header
+ c: match within the Cc header
+ f: match within the From header
+ a: match within the To, Cc, and From headers
+ tc: match within the To and Cc headers
+ l: match contents of the List-Id header
+ bs: match within the Subject and body
+ dfn: match filename from diff
+ dfa: match diff removed (-) lines
+ dfb: match diff added (+) lines
+ dfhh: match diff hunk header context (usually a function name)
+ dfctx: match diff context lines
+ dfpre: match pre-image git blob ID
+ dfpost: match post-image git blob ID
+ dfblob: match either pre or post-image git blob ID
+ rt: match received time, like `d:' if sender's clock was correct
+
+=for comment
+AUTO-GENERATED-SEARCH-TERMS-END
+
+Additional search prefixes which only affect the local lei/store:
+
+ L: match the given label
+ kw: match the given keywords
+
+See L<lei-tag(1)> for more info on labels and keywords.
+
+Most prefixes are probabilistic, meaning they support stemming
+and wildcards (C<*>). Ranges (such as C<d:>) and boolean prefixes
+do not support stemming or wildcards.
+The upstream Xapian query parser documentation fully explains
+the query syntax: L<https://xapian.org/docs/queryparser.html>
+