diff --git a/doc/src/sgml/logicaldecoding.sgml b/doc/src/sgml/logicaldecoding.sgml
index 35ac5abbe5e..7e1a3b454fe 100644
--- a/doc/src/sgml/logicaldecoding.sgml
+++ b/doc/src/sgml/logicaldecoding.sgml
@@ -363,7 +363,7 @@ $ pg_recvlogical -d postgres --slot test --drop-slot
    </para>
    <sect2 id="logicaldecoding-output-init">
     <title>Initialization Function</title>
-    <indexterm zone="logicaldecoding">
+    <indexterm zone="logicaldecoding-output-init">
      <primary>_PG_output_plugin_init</primary>
     </indexterm>
     <para>