diff --git a/lca_carbon_workflow.py b/lca_carbon_workflow.py
index c208e87..59a206d 100644
--- a/lca_carbon_workflow.py
+++ b/lca_carbon_workflow.py
@@ -142,6 +142,18 @@ class LCACarbonWorkflow:
         building_opening_workload, building_component_workload
 
   def _calculate_envelope_emission(self, boundary):
+    """
+      The method calculates embodied and end of life emission of the building's
+      envelope by iterating through each building boundary's layers. The
+      argument corresponding to the boundary parameter comes from the
+      calculate_building_component_emission() method. The output also is used
+      in the calculate_building_component_emission() method. So the current
+      method is hidden to the user.
+      :param boundary: <class
+      'hub.city_model_structure.
+      building_demand.thermal_boundary.ThermalBoundary'>
+      :return: <class 'tuple'>
+    """
     layer_emission = []
     layer_end_of_life_emission = []
     for layer in boundary.layers:
@@ -170,14 +182,16 @@ class LCACarbonWorkflow:
           building, surface, boundary, opaque_surface_code,
           density=2579):
     """
-      This calculates the opening emission based on the mentioned parameters.
+      This calculates the opening emission by iterating through each thermal
+      opening of each building's boundary. It is done based on the mentioned
+      parameters.
       The arguments come from the calculate_building_component_emission()
       method and the output is used in the same method. So the current method
       is hidden to the user.
       Windows have the assumed density of 2579 kg/m3
       Window's thickness assumed the same as wall's thickness
-      These two values are being used to calculate window's workload
-      for End of Life emission evaluation.
+      These two values are being used to calculate window's workload for
+      the End of Life emission evaluation.
       :param building: <class 'hub.city_model_structure.building.Building'>
       :param surface: <class
       'hub.city_model_structure.building_demand.surface.Surface'>