help: document new search prefixes

[public-inbox.git] / lib / PublicInbox / WwwText.pm

diff --git a/lib/PublicInbox/WwwText.pm b/lib/PublicInbox/WwwText.pm
index b8beb97c6d5983e9c319a2f7733a4e232fc7f884..b0f262cd08d823af81944b5484b63d849c913570 100644 (file)
--- a/lib/PublicInbox/WwwText.pm
+++ b/lib/PublicInbox/WwwText.pm
@@ -134,7 +134,7 @@ search
     in other search engines.
 
     We also support search prefixes to limit the scope of the
-    search to certain fields using prefixes.
+    search to certain fields.
 
     Prefixes supported in this installation include:
 
@@ -142,6 +142,10 @@ EOF
                _srch_prefix($srch, $txt);
 
                $$txt .= <<EOF;
+
+    Most prefixes are probabilistic, meaning they support stemming
+    and wildcards ('*').  Ranges (such as 'd:') and boolean prefixes
+    do not support stemming or wildcards.
     The upstream Xapian query parser documentation fully explains
     the query syntax: