1 files changed, 2 insertions, 0 deletions
diff --git a/src/Build/RelationshipHandler.php b/src/Build/RelationshipHandler.php
index 1ea3567..c17def9 100644
--- a/src/Build/RelationshipHandler.php
+++ b/src/Build/RelationshipHandler.php
@@ -9,6 +9,8 @@ use Symfony\Component\VarExporter\VarExporter;
 final class RelationshipHandler implements RegionHandler
 {
     /**
+     * A map of region codes to their child region codes.
+     *
      * @var array<string, int[]>
      */
     private array $data = [];