diff --git a/doc/src/sgml/ref/alter_materialized_view.sgml b/doc/src/sgml/ref/alter_materialized_view.sgml
index b60451374b..e5617067f6 100644
--- a/doc/src/sgml/ref/alter_materialized_view.sgml
+++ b/doc/src/sgml/ref/alter_materialized_view.sgml
@@ -15,7 +15,7 @@ PostgreSQL documentation
   <refpurpose>change the definition of a materialized view</refpurpose>
  </refnamediv>
 
- <indexterm zone="sql-alterview">
+ <indexterm zone="sql-altermaterializedview">
   <primary>ALTER MATERIALIZED VIEW</primary>
  </indexterm>