diff --git a/reference/pgsql/functions/pg-field-prtlen.xml b/reference/pgsql/functions/pg-field-prtlen.xml
index cdcb73f8b6..1949d33251 100644
--- a/reference/pgsql/functions/pg-field-prtlen.xml
+++ b/reference/pgsql/functions/pg-field-prtlen.xml
@@ -24,7 +24,7 @@
    <function>pg_field_prtlen</function> returns the actual printed
    length (number of characters) of a specific value in a PostgreSQL
    <parameter>result</parameter>.  Row numbering starts at 0.  This
-   function will return -1 on an error.
+   function will return &false; on an error.
   </para>
   <para>
    <parameter>field_name_or_number</parameter> can be passed either as an