diff --git a/doc/src/sgml/postgres.sgml b/doc/src/sgml/postgres.sgml
index 897de1be1bd..22a74d95f61 100644
--- a/doc/src/sgml/postgres.sgml
+++ b/doc/src/sgml/postgres.sgml
@@ -188,6 +188,7 @@ Information for extending <ProductName>Postgres</ProductName>.
 &xtypes;
 &xoper;
 &xaggr;
+&rules;
 &xindex;
 &gist;
 &dfunc;
diff --git a/doc/src/sgml/programmer.sgml b/doc/src/sgml/programmer.sgml
index 3c73484e077..f8e95c8dd11 100644
--- a/doc/src/sgml/programmer.sgml
+++ b/doc/src/sgml/programmer.sgml
@@ -134,6 +134,7 @@ It provides SQL92/SQL3 language support,
 &xtypes;
 &xoper;
 &xaggr;
+&rules;
 &xindex;
 &gist;
 &dfunc;