diff --git a/dettact.py b/dettact.py
index e4ad9bc..0e278e3 100644
--- a/dettact.py
+++ b/dettact.py
@@ -57,7 +57,7 @@ def init_menu():
                                    action='store_true')
     parser_visibility.add_argument('-e', '--excel', help='generate an Excel sheet with all administrated techniques',
                                      action='store_true')
-    parser_visibility.add_argument('-o', '--overlay', help='generate a visibility layer overlayed with detections for '
+    parser_visibility.add_argument('-o', '--overlay', help='generate a visibility layer overlaid with detections for '
                                                            'the ATT&CK navigator', action='store_true')
     parser_visibility.add_argument('--health', help='check the technique YAML file for errors', action='store_true')
 
@@ -80,7 +80,7 @@ def init_menu():
                                   action='store_true')
     parser_detection.add_argument('-e', '--excel', help='generate an Excel sheet with all administrated techniques',
                                    action='store_true')
-    parser_detection.add_argument('-o', '--overlay', help='generate a detection layer overlayed with visibility for '
+    parser_detection.add_argument('-o', '--overlay', help='generate a detection layer overlaid with visibility for '
                                                           'the ATT&CK navigator', action='store_true')
     parser_detection.add_argument('-g', '--graph', help='generate a graph with detections added through time',
                                   action='store_true')
diff --git a/interactive_menu.py b/interactive_menu.py
index d712d73..5bcaef6 100644
--- a/interactive_menu.py
+++ b/interactive_menu.py
@@ -264,7 +264,7 @@ def menu_detection(filename_t):
     print('')
     print('Select what you want to do:')
     print('2. Generate a layer for detection coverage for the ATT&CK Navigator.')
-    print('3. Generate a layer for detection coverage overlayed with visibility for the ATT&CK Navigator.')
+    print('3. Generate a layer for detection coverage overlaid with visibility for the ATT&CK Navigator.')
     print('4. Generate a graph with detections added through time.')
     print('5. Generate an Excel sheet with all administrated techniques.')
     print('6. Check the technique YAML file for errors.')
@@ -323,7 +323,7 @@ def menu_visibility(filename_t, filename_ds):
     print('')
     print('Select what you want to do:')
     print('2. Generate a layer for visibility for the ATT&CK Navigator.')
-    print('3. Generate a layer for visibility overlayed with detection coverage for the ATT&CK Navigator.')
+    print('3. Generate a layer for visibility overlaid with detection coverage for the ATT&CK Navigator.')
     print('4. Generate an Excel sheet with all administrated techniques.')
     print('5. Check the technique YAML file for errors.')
     print('9. Back to main menu.')
@@ -336,7 +336,7 @@ def menu_visibility(filename_t, filename_ds):
         generate_visibility_layer(filename_t, filename_ds, False, filter_applicable_to)
         wait()
     elif choice == '3':
-        print('Writing visibility coverage layer overlayed with detections...')
+        print('Writing visibility coverage layer overlaid with detections...')
         generate_visibility_layer(filename_t, filename_ds, True, filter_applicable_to)
         wait()
     elif choice == '4':
diff --git a/technique_mapping.py b/technique_mapping.py
index 174030b..cc7f230 100644
--- a/technique_mapping.py
+++ b/technique_mapping.py
@@ -6,7 +6,7 @@ import xlsxwriter
 
 def generate_detection_layer(filename_techniques, filename_data_sources, overlay, filter_applicable_to):
     """
-    Generates layer for detection coverage and optionally an overlayed version with visibility coverage.
+    Generates layer for detection coverage and optionally an overlaid version with visibility coverage.
     :param filename_techniques: the filename of the yaml file containing the techniques administration
     :param filename_data_sources: the filename of the yaml file containing the data sources administration
     :param overlay: boolean value to specify if an overlay between detection and visibility should be generated
@@ -21,14 +21,14 @@ def generate_detection_layer(filename_techniques, filename_data_sources, overlay
     else:
         my_techniques, name, platform = load_techniques(filename_techniques, 'all', filter_applicable_to)
         my_data_sources = _load_data_sources(filename_data_sources)
-        mapped_techniques_both = _map_and_colorize_techniques_for_overlayed(my_techniques, my_data_sources, filter_applicable_to)
+        mapped_techniques_both = _map_and_colorize_techniques_for_overlaid(my_techniques, my_data_sources, filter_applicable_to)
         layer_both = get_layer_template_layered('Visibility and Detection ' + name + ' ' + filter_applicable_to, 'description', 'attack', platform)
         _write_layer(layer_both, mapped_techniques_both, 'visibility_and_detection', filter_applicable_to, name)
 
 
 def generate_visibility_layer(filename_techniques, filename_data_sources, overlay, filter_applicable_to):
     """
-    Generates layer for visibility coverage and optionally an overlayed version with detection coverage.
+    Generates layer for visibility coverage and optionally an overlaid version with detection coverage.
     :param filename_techniques: the filename of the yaml file containing the techniques administration
     :param filename_data_sources: the filename of the yaml file containing the data sources administration
     :param overlay: boolean value to specify if an overlay between detection and visibility should be generated
@@ -44,7 +44,7 @@ def generate_visibility_layer(filename_techniques, filename_data_sources, overla
         _write_layer(layer_visibility, mapped_techniques_visibility, 'visibility', filter_applicable_to, name)
     else:
         my_techniques, name, platform = load_techniques(filename_techniques, 'all', filter_applicable_to)
-        mapped_techniques_both = _map_and_colorize_techniques_for_overlayed(my_techniques, my_data_sources, filter_applicable_to)
+        mapped_techniques_both = _map_and_colorize_techniques_for_overlaid(my_techniques, my_data_sources, filter_applicable_to)
         layer_both = get_layer_template_layered('Visibility and Detection ' + name + ' ' + filter_applicable_to, 'description', 'attack', platform)
         _write_layer(layer_both, mapped_techniques_both, 'visibility_and_detection', filter_applicable_to, name)
 
@@ -233,7 +233,7 @@ def _map_and_colorize_techniques_for_visibility(my_techniques, my_data_sources):
     return mapped_techniques
 
 
-def _map_and_colorize_techniques_for_overlayed(my_techniques, my_data_sources, filter_applicable_to):
+def _map_and_colorize_techniques_for_overlaid(my_techniques, my_data_sources, filter_applicable_to):
     """
     Determine the color of the techniques based on both detection and visibility.
     :param my_techniques: the configured techniques