diff --git a/building_selection_tool.py b/building_selection_tool.py
index dcfaeb9..b7b05da 100644
--- a/building_selection_tool.py
+++ b/building_selection_tool.py
@@ -26,8 +26,7 @@ class BuildingSelectionTool:
   def select_by_polygon(self, selection_polygon_coordinates):
     """
     Get all buildings within a specified polygon and write the output to output_file_path
-    :param selection_polygon: list of coordinates forming the selection polygon
-    :param output_file_path: path and file name for output file containing selected buildings and their metadata
+    :param selection_polygon_coordinates: list of coordinates forming the selection polygon
     :return: None
     """
     selection_polygon = Polygon(selection_polygon_coordinates)
@@ -42,15 +41,24 @@ class BuildingSelectionTool:
   def select_by_coordinate(self, coordinate):
     """
     :param coordinate: longitude, latitude coordinate of selected
-    :return:
+    :return: None
     """
-    pass
+    longitude = coordinate[0]
+    latitude = coordinate[1]
+
+    point = Point([longitude, latitude])
+
+    for building in self.buildings:
+      building_coordinates = building['geometry']['coordinates'][0]
+      building_polygon = Polygon(building_coordinates)
+      if point.within(building_polygon):
+        self.selected_buildings.append(building)
 
   def select_by_address(self, address):
     """
-
+    Select a building by inputting an address
     :param address:
-    :return:
+    :return: None
     """
     coordinates = helpers.get_gps_coordinate_by_address(address)
     longitude = coordinates[1]
@@ -66,8 +74,9 @@ class BuildingSelectionTool:
 
   def save_selected_buildings(self, output_file_path):
     """
-
-    :return:
+    Save all selected buildings to an output file.
+    :param output_file_path: destination file path including file name and extension
+    :return: None
     """
     output_file = Path(output_file_path).resolve()
     output_region = {"type": "FeatureCollection",
diff --git a/main.py b/main.py
index 48331ab..58cec0d 100644
--- a/main.py
+++ b/main.py
@@ -2,6 +2,7 @@ from building_selection_tool import BuildingSelectionTool
 
 selection_tool = BuildingSelectionTool('./data/collinear_clean.geojson')
 
+# select all buildings within a polygon
 sample_polygon_coordinates = [[-73.543833, 45.575932],
                  [-73.541834, 45.575245],
                  [-73.542275, 45.574652],
@@ -10,8 +11,14 @@ sample_polygon_coordinates = [[-73.543833, 45.575932],
 
 selection_tool.select_by_polygon(sample_polygon_coordinates)
 
+# select building by address
 sample_address = "2155 Rue Guy, Montreal, Quebec"
 selection_tool.select_by_address(sample_address)
 
+# select building by [longitude, latitude] coordinate
+sample_coordinate = [-73.5790796, 45.4972906]
+selection_tool.select_by_coordinate(sample_coordinate)
+
+# save selected buildings in geojson format to specified output_file_path
 output_file_path = "./output_files/sample_output.geojson"
 selection_tool.save_selected_buildings(output_file_path)