diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml
index d3f121ba249..0bb80d784da 100644
--- a/doc/src/sgml/func.sgml
+++ b/doc/src/sgml/func.sgml
@@ -13423,7 +13423,7 @@ CREATE TYPE rainbow AS ENUM ('red', 'orange', 'yellow', 'green', 'blue', 'purple
  <sect1 id="functions-uuid">
   <title>UUID Functions</title>
 
-  <indexterm zone="datatype-uuid">
+  <indexterm zone="functions-uuid">
    <primary>UUID</primary>
    <secondary>generating</secondary>
   </indexterm>