diff --git a/doc/src/sgml/release.sgml b/doc/src/sgml/release.sgml
index a659d382db9..ae6cc3cc2cb 100644
--- a/doc/src/sgml/release.sgml
+++ b/doc/src/sgml/release.sgml
@@ -6,7 +6,7 @@ Typical markup:
 &<>                             use & escapes
 PostgreSQL                      <productname>
 postgresql.conf, pg_hba.conf    <filename>
-\<[A-Z][A-Z_ ]+[A-Z_]\>         <command>, <literal>, <envar>, <acronym>
+\<[A-Z][A-Z_. ]+[A-Z_.]\>       <command>, <envar>, <acronym>, <literal>
 \<[A-Za-z_][A-Za-z0-9_]+()      <function>
 \-\-?[A-Za-z_]+[-A-Za-z_]*      <option> (use backslashes to avoid SGML markup)
 \<[A-Za-z_]+/[A-Za-z_]+\>       <filename>