diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index 950f5086de..fe58fa5524 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -6580,6 +6580,14 @@ SELECT regexp_match('abc01234xyz', '(?:(.*?)(\d+)(.*)){1,1}');
       </para>
      </listitem>
 
+     <listitem>
+      <para>
+       If the format provides fewer fractional digits than the number being
+       formatted, <function>to_char()</function> will round the number to
+       the specified number of fractional digits.
+      </para>
+     </listitem>
+
      <listitem>
       <para>
        The pattern characters <literal>S</literal>, <literal>L</literal>, <literal>D</literal>,