diff --git a/imports/geometry/citygml.py b/imports/geometry/citygml.py
index 322352ab..f201bffe 100644
--- a/imports/geometry/citygml.py
+++ b/imports/geometry/citygml.py
@@ -81,7 +81,7 @@ class CityGml:
       surfaces = CityGmlLod2(city_object).surfaces
     else:
       raise NotImplementedError("Not supported level of detail")
-    return Building(name, lod, surfaces, year_of_construction, function, self._lower_corner,[])
+    return Building(name, lod, surfaces, year_of_construction, function, self._lower_corner, [])
 
   def _create_parts_consisting_building(self):
     raise NotImplementedError
@@ -101,4 +101,4 @@ class CityGml:
           raise NotImplementedError("Building cluster")
         else:
           self._city.add_city_object(self._create_building(city_object))
-    return self._city
\ No newline at end of file
+    return self._city
diff --git a/imports/geometry/citygml_base.py b/imports/geometry/citygml_base.py
index fba02994..db473e6c 100644
--- a/imports/geometry/citygml_base.py
+++ b/imports/geometry/citygml_base.py
@@ -1,14 +1,26 @@
+"""
+CityGmlBase module abstract class to template the different level of details
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2021 Project Author Guille Gutierrez guillermo.gutierrezmorote@concordia.ca
+"""
+
 from abc import ABC
 import numpy as np
 from imports.geometry.helpers.geometry_helper import GeometryHelper
 
 
 class CityGmlBase(ABC):
+  """
+  CityGmlBase class inherited by the specific level of detail classes.
+  """
   def __init__(self):
     self._surfaces = []
 
   @property
   def surfaces(self):
+    """
+    parsed surfaces
+    """
     return self._surfaces
 
   @staticmethod
@@ -19,11 +31,6 @@ class CityGmlBase(ABC):
 
   @staticmethod
   def _solid_points(coordinates) -> np.ndarray:
-    """
-    Solid surface point matrix [[x, y, z],[x, y, z],...]
-    :parameter coordinates: string from file
-    :return: np.ndarray
-    """
     solid_points = np.fromstring(coordinates, dtype=float, sep=' ')
     solid_points = GeometryHelper.to_points_matrix(solid_points)
     return solid_points
diff --git a/imports/geometry/citygml_lod1.py b/imports/geometry/citygml_lod1.py
index a9cd94a3..7c829442 100644
--- a/imports/geometry/citygml_lod1.py
+++ b/imports/geometry/citygml_lod1.py
@@ -1,9 +1,18 @@
+"""
+CityGmlLod1 module parses citygml files with level of detail 1 and import the geometry into the city model structure
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2021 Project Author Guille Gutierrez guillermo.gutierrezmorote@concordia.ca
+"""
+
 from imports.geometry.citygml_base import CityGmlBase
 from city_model_structure.attributes.surface import Surface
 from city_model_structure.attributes.polygon import Polygon
 
 
 class CityGmlLod1(CityGmlBase):
+  """
+  CityGmlLod1 class to parse level of detail 1 city gml files
+  """
 
   @classmethod
   def _multi_curve(cls, o):
diff --git a/imports/geometry/citygml_lod2.py b/imports/geometry/citygml_lod2.py
index 0474d16b..bcf26d0b 100644
--- a/imports/geometry/citygml_lod2.py
+++ b/imports/geometry/citygml_lod2.py
@@ -1,3 +1,9 @@
+"""
+CityGmlLod1 module parses citygml files with level of detail 1 and import the geometry into the city model structure
+SPDX - License - Identifier: LGPL - 3.0 - or -later
+Copyright © 2021 Project Author Guille Gutierrez guillermo.gutierrezmorote@concordia.ca
+"""
+
 from imports.geometry.citygml_base import CityGmlBase
 from city_model_structure.attributes.surface import Surface
 from city_model_structure.attributes.polygon import Polygon
@@ -5,7 +11,9 @@ from imports.geometry.helpers.geometry_helper import GeometryHelper
 
 
 class CityGmlLod2(CityGmlBase):
-
+  """
+  CityGmlLod1 class to parse level of detail 1 city gml files
+  """
   def __init__(self, o):
     super().__init__()
     self._o = o