diff --git a/check_home_assistant_state.py b/check_home_assistant_state.py
index 11a69dc..8a5fcbc 100755
--- a/check_home_assistant_state.py
+++ b/check_home_assistant_state.py
@@ -66,6 +66,7 @@ class AttributeFilter:
 class Entities(nagiosplugin.Resource):
     url: str
     token: str
+    domain: str
     device_class: str
     numeric: bool
     area: str
@@ -149,6 +150,8 @@ class Entities(nagiosplugin.Resource):
 
     def probe(self):
         template_filter = "states"
+        if self.domain:
+            template_filter += f"|selectattr('domain', 'eq', '{ self.domain }')"
         if self.device_class:
             template_filter += (
                 f"|selectattr('attributes.device_class', 'eq', '{ self.device_class }')"
@@ -351,6 +354,12 @@ def main():
     common_args = shared_parser.add_argument_group(
         "Common Arguments", "Arguments shared between metric types"
     )
+    common_args.add_argument(
+        "--domain",
+        type=str,
+        required=False,
+        help="domain of entities to monitor",
+    )
     common_args.add_argument(
         "-d",
         "--device-class",