Add None to hint.

denpamusic · Nov 17, 2023 · d27c85d · d27c85d
1 parent 3c4c296
commit d27c85d
Showing 1 changed file with 1 addition and 1 deletion.
diff --git a/pyplumio/helpers/parameter.py b/pyplumio/helpers/parameter.py
@@ -222,7 +222,7 @@ def max_value(self) -> ParameterValueType:
         return self._values.max_value
 
     @property
-    def unit_of_measurement(self) -> UnitOfMeasurement | Literal["%"]:
+    def unit_of_measurement(self) -> UnitOfMeasurement | Literal["%"] | None:
         """A unit of measurement."""
         return self.description.unit_of_measurement