diff --git a/pybamm/models/submodels/thermal/base_thermal.py b/pybamm/models/submodels/thermal/base_thermal.py
index 157d6b1efb..4c476ee897 100644
--- a/pybamm/models/submodels/thermal/base_thermal.py
+++ b/pybamm/models/submodels/thermal/base_thermal.py
@@ -12,8 +12,6 @@ class BaseThermal(pybamm.BaseSubModel):
     ----------
     param : parameter class
         The parameters to use for this submodel
-    domain : str
-        The domain of the submodel (e.g., "negative electrode")
     options : dict, optional
         A dictionary of options to be passed to the model.
     """