diff --git a/apps/abstraction/transformation.py b/apps/abstraction/transformation.py
index 0b49d2f..7fd2637 100644
--- a/apps/abstraction/transformation.py
+++ b/apps/abstraction/transformation.py
@@ -511,6 +511,8 @@ TRANSFORM_HANDLERS: dict[tuple[str, str, str], TransformHandler] = {
     ("relay", "zigbee2mqtt", "to_abstract"): _transform_relay_zigbee2mqtt_to_abstract,
     ("relay", "shelly", "to_vendor"): _transform_relay_shelly_to_vendor,
     ("relay", "shelly", "to_abstract"): _transform_relay_shelly_to_abstract,
+    ("relay", "hottis_modbus", "to_vendor"): _transform_relay_hottis_modbus_to_vendor,
+    ("relay", "hottis_modbus", "to_abstract"): _transform_relay_hottis_modbus_to_abstract,
 }