diff --git a/src/docbkx/reference/jpa.xml b/src/docbkx/reference/jpa.xml
index 28fcb53dd..b7fecb1ef 100644
--- a/src/docbkx/reference/jpa.xml
+++ b/src/docbkx/reference/jpa.xml
@@ -764,7 +764,7 @@ public interface UserRepository extends JpaRepository<User, Long> {
   </section>
 
   <section>
-    <title>Locking</title>
+    <title id="locking">Locking</title>
 
     <para>To specify the lock mode to be used the
     <interfacename>@Lock</interfacename> annotation can be used on query