diff --git a/doc/src/sgml/ltree.sgml b/doc/src/sgml/ltree.sgml
index ae4b33ec85..4971b71524 100644
--- a/doc/src/sgml/ltree.sgml
+++ b/doc/src/sgml/ltree.sgml
@@ -506,16 +506,16 @@ Europe & Russia*@ & !Transportation
     <literal>@</literal>, <literal>~</literal>, <literal>?</literal>
    </para>
    <para>
     <literal>gist_ltree_ops</literal> GiST opclass approximates {+a+} set of
     path labels as a bitmap signature.  [-Optional-]{+Its optional+} integer parameter
     <literal>siglen</literal>[-of <literal>gist_ltree_ops</literal>-] determines {+the+}
     signature length in bytes.  [-Default-]{+The default+} signature length is 8 bytes.
     Valid values of signature length are between 1 and 2024 bytes.  Longer
     signatures [-leads-]{+lead+} to {+a+} more precise search [-(scan less-]{+(scanning a smaller+} fraction of [-index, scan-]