diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index f8a0d76d12b..343e2dd9f17 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -17646,9 +17646,9 @@ SELECT '{
      Boolean predicate, whereas the SQL standard allows predicates only within
      filters. While SQL-standard path expressions return the relevant
      element(s) of the queried JSON value, predicate check expressions
-     return the single three-valued result of the
+     return the single three-valued <type>jsonb</type> result of the
      predicate: <literal>true</literal>,
-     <literal>false</literal>, or <literal>unknown</literal>.
+     <literal>false</literal>, or <literal>null</literal>.
      For example, we could write this SQL-standard filter expression:
 <screen>
 <prompt>=&gt;</prompt> <userinput>select jsonb_path_query(:'json', '$.track.segments ?(@[*].HR &gt; 130)');</userinput>