diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 93f11faada5..8a5cc253f3b 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -20022,6 +20022,11 @@ SELECT NULLIF(value, '(none)') ...
          <type>anyrange</type> )
         <returnvalue>anymultirange</returnvalue>
        </para>
+       <para role="func_signature">
+        <function>range_intersect_agg</function> ( <parameter>value</parameter>
+         <type>anymultirange</type> )
+        <returnvalue>anymultirange</returnvalue>
+       </para>
        <para>
         Computes the intersection of the non-null input values.
        </para></entry>