diff --git a/src/Bundle/ChillMainBundle/Entity/PostalCode.php b/src/Bundle/ChillMainBundle/Entity/PostalCode.php
index 484a9e322..4569915b4 100644
--- a/src/Bundle/ChillMainBundle/Entity/PostalCode.php
+++ b/src/Bundle/ChillMainBundle/Entity/PostalCode.php
@@ -21,10 +21,11 @@ use Symfony\Component\Serializer\Annotation\Groups;
  * @ORM\Entity
  * @ORM\Table(
  *     name="chill_main_postal_code",
- *     indexes={@ORM\Index(
- *         name="search_name_code",
- *         columns={"code", "label"}
- *     )})
+ *     indexes={
+ *         @ORM\Index(name="search_name_code", columns={"code", "label"}),
+ *         @ORM\Index(name="search_by_reference_code", colums={"code", "refpostalcodeid"})
+ *     })
+ *
  *     @ORM\HasLifecycleCallbacks
  */
 class PostalCode
diff --git a/src/Bundle/ChillMainBundle/migrations/Version20220506145935.php b/src/Bundle/ChillMainBundle/migrations/Version20220506145935.php
new file mode 100644
index 000000000..9df382214
--- /dev/null
+++ b/src/Bundle/ChillMainBundle/migrations/Version20220506145935.php
@@ -0,0 +1,33 @@
+<?php
+
+/**
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+declare(strict_types=1);
+
+namespace Chill\Migrations\Main;
+
+use Doctrine\DBAL\Schema\Schema;
+use Doctrine\Migrations\AbstractMigration;
+
+final class Version20220506145935 extends AbstractMigration
+{
+    public function down(Schema $schema): void
+    {
+        $this->addSql('DROP INDEX search_by_reference_code');
+    }
+
+    public function getDescription(): string
+    {
+        return 'Add index to search postal code by references';
+    }
+
+    public function up(Schema $schema): void
+    {
+        $this->addSql('CREATE INDEX search_by_reference_code ON chill_main_postal_code (code, refpostalcodeid)');
+    }
+}