diff --git a/doc/src/sgml/func/func-json.sgml b/doc/src/sgml/func/func-json.sgml
index 0763ec81ed8..cc021e18bcb 100644
--- a/doc/src/sgml/func/func-json.sgml
+++ b/doc/src/sgml/func/func-json.sgml
@@ -710,15 +710,29 @@
        <entry role="func_table_entry"><para role="func_signature">
          <indexterm><primary>json_object</primary></indexterm>
          <function>json_object</function> (
-         <optional> { <replaceable>key_expression</replaceable> { <literal>VALUE</literal> | ':' }
-          <replaceable>value_expression</replaceable> <optional> <literal>FORMAT JSON</literal> <optional> <literal>ENCODING UTF8</literal> </optional> </optional> }<optional>, ...</optional> </optional>
+          { <replaceable>key_expression</replaceable> { <literal>VALUE</literal> | ':' }
+          <replaceable>value_expression</replaceable> <optional>
+          <literal>FORMAT JSON</literal> <optional> <literal>ENCODING UTF8</literal> </optional> </optional> }<optional>, ...</optional>
          <optional> { <literal>NULL</literal> | <literal>ABSENT</literal> } <literal>ON NULL</literal> </optional>
          <optional> { <literal>WITH</literal> | <literal>WITHOUT</literal> } <literal>UNIQUE</literal> <optional> <literal>KEYS</literal> </optional> </optional>
          <optional> <literal>RETURNING</literal> <replaceable>data_type</replaceable> <optional> <literal>FORMAT JSON</literal> <optional> <literal>ENCODING UTF8</literal> </optional> </optional> </optional>)
         </para>
+
+       <para role="func_signature">
+        <indexterm>
+         <primary>json_object</primary>
+        </indexterm>
+        <function>json_object</function> (
+         <optional> <literal>RETURNING</literal> <replaceable>data_type</replaceable>
+         <optional> <literal>FORMAT JSON</literal>
+         <optional> <literal>ENCODING UTF8</literal> </optional> </optional> </optional>)
+       </para>
+
         <para>
-         Constructs a JSON object of all the key/value pairs given,
-         or an empty object if none are given.
+         The first form constructs a JSON object of all the key/value pairs
+         given; the second form constructs an empty JSON object.
+         The result is of type <type>json</type> unless
+         <literal>RETURNING</literal> specifies a different type.
          <replaceable>key_expression</replaceable> is a scalar expression
          defining the <acronym>JSON</acronym> key, which is
          converted to the <type>text</type> type.
@@ -735,6 +749,10 @@
         <para>
          <literal>json_object('code' VALUE 'P123', 'title': 'Jaws')</literal>
          <returnvalue>{"code" : "P123", "title" : "Jaws"}</returnvalue>
+        </para>
+        <para>
+         <literal>json_object(RETURNING jsonb)</literal>
+         <returnvalue>{}</returnvalue>
        </para></entry>
       </row>