diff --git a/GeoJSON-Core.package/GJCityAddress.class/class/neoJsonMapping..st b/GeoJSON-Core.package/GJCityAddress.class/class/neoJsonMapping..st
new file mode 100644
index 0000000..8f1d253
--- /dev/null
+++ b/GeoJSON-Core.package/GJCityAddress.class/class/neoJsonMapping..st
@@ -0,0 +1,5 @@
+accessing
+neoJsonMapping: mapper
+	super neoJsonMapping: mapper.
+	mapper for: self do: [ :mapping |
+		mapping mapInstVars: #(city) ].