diff --git a/src/slic3r/GUI/NotificationManager.cpp b/src/slic3r/GUI/NotificationManager.cpp
index e05931d873..4a63a82b09 100644
--- a/src/slic3r/GUI/NotificationManager.cpp
+++ b/src/slic3r/GUI/NotificationManager.cpp
@@ -25,7 +25,7 @@ namespace GUI {
 
 wxDEFINE_EVENT(EVT_EJECT_DRIVE_NOTIFICAION_CLICKED, EjectDriveNotificationClickedEvent);
 wxDEFINE_EVENT(EVT_EXPORT_GCODE_NOTIFICAION_CLICKED, ExportGcodeNotificationClickedEvent);
-wxDEFINE_EVENT(EVT_PRESET_UPDATE_AVIABLE_CLICKED, PresetUpdateAviableClickedEvent);
+wxDEFINE_EVENT(EVT_PRESET_UPDATE_AVAILABLE_CLICKED, PresetUpdateAvailableClickedEvent);
 
 namespace Notifications_Internal{
 	void push_style_color(ImGuiCol idx, const ImVec4& col, bool fading_out, float current_fade_opacity)
@@ -531,11 +531,11 @@ void NotificationManager::PopNotification::on_text_click()
 		if (m_evt_handler != nullptr)
 			wxPostEvent(m_evt_handler, ExportGcodeNotificationClickedEvent(EVT_EXPORT_GCODE_NOTIFICAION_CLICKED));
 		break;
-	case NotificationType::PresetUpdateAviable :
+	case NotificationType::PresetUpdateAvailable :
 		//wxGetApp().plater()->export_gcode(false);
 		assert(m_evt_handler != nullptr);
 		if (m_evt_handler != nullptr)
-			wxPostEvent(m_evt_handler, PresetUpdateAviableClickedEvent(EVT_PRESET_UPDATE_AVIABLE_CLICKED));
+			wxPostEvent(m_evt_handler, PresetUpdateAvailableClickedEvent(EVT_PRESET_UPDATE_AVAILABLE_CLICKED));
 		break;
 	case NotificationType::NewAppAviable:
 		wxLaunchDefaultBrowser("https://github.com/prusa3d/PrusaSlicer/releases");
diff --git a/src/slic3r/GUI/NotificationManager.hpp b/src/slic3r/GUI/NotificationManager.hpp
index 1972c92440..ecd1030516 100644
--- a/src/slic3r/GUI/NotificationManager.hpp
+++ b/src/slic3r/GUI/NotificationManager.hpp
@@ -16,8 +16,8 @@ using EjectDriveNotificationClickedEvent = SimpleEvent;
 wxDECLARE_EVENT(EVT_EJECT_DRIVE_NOTIFICAION_CLICKED, EjectDriveNotificationClickedEvent);
 using ExportGcodeNotificationClickedEvent = SimpleEvent;
 wxDECLARE_EVENT(EVT_EXPORT_GCODE_NOTIFICAION_CLICKED, ExportGcodeNotificationClickedEvent);
-using PresetUpdateAviableClickedEvent = SimpleEvent;
-wxDECLARE_EVENT(EVT_PRESET_UPDATE_AVIABLE_CLICKED, PresetUpdateAviableClickedEvent);
+using PresetUpdateAvailableClickedEvent = SimpleEvent;
+wxDECLARE_EVENT(EVT_PRESET_UPDATE_AVAILABLE_CLICKED, PresetUpdateAvailableClickedEvent);
 
 class GLCanvas3D;
 class ImGuiWrapper;
@@ -25,17 +25,35 @@ class ImGuiWrapper;
 enum class NotificationType
 {
 	CustomNotification,
+	// Notification on end of slicing and G-code processing (the full G-code preview is available).
+	// Contains a hyperlink to export the G-code to a removable media.
 	SlicingComplete,
+	// Not used.
 	SlicingNotPossible,
+	// Notification on end of export to a removable media, with hyperling to eject the external media.
 	ExportToRemovableFinished,
+	// Works on OSX only.
+	//FIXME Do we want to have it on Linux and Windows? Is it possible to get the Disconnect event on Windows?
 	Mouse3dDisconnected,
+	// Not used.
 	Mouse3dConnected,
+	// Not used.
 	NewPresetsAviable,
+	// Notification on the start of PrusaSlicer, when a new PrusaSlicer version is published.
+	// Contains a hyperlink to open a web browser pointing to the PrusaSlicer download location.
 	NewAppAviable,
-	PresetUpdateAviable,
+	// Notification on the start of PrusaSlicer, when updates of system profiles are detected.
+	// Contains a hyperlink to execute installation of the new system profiles.
+	PresetUpdateAvailable,
+	// Not used.
 	LoadingFailed,
-	ValidateError, // currently not used - instead Slicing error is used for both slicing and validate errors
+	// Not used - instead Slicing error is used for both slicing and validate errors.
+	ValidateError,
+	// Slicing error produced by BackgroundSlicingProcess::validate() or by the BackgroundSlicingProcess background
+	// thread thowing a SlicingError exception.
 	SlicingError,
+	// Slicing warnings, issued by the slicing process.
+	// Slicing warnings are registered for a Print step or a PrintObject step, 
 	SlicingWarning,
 	PlaterError,
 	PlaterWarning,
@@ -260,12 +278,13 @@ private:
 
 	//prepared (basic) notifications
 	const std::vector<NotificationData> basic_notifications = {
+		// Currently not used.
 		{NotificationType::SlicingNotPossible, NotificationLevel::RegularNotification, 10,  _u8L("Slicing is not possible.")},
 		{NotificationType::ExportToRemovableFinished, NotificationLevel::ImportantNotification, 0,  _u8L("Exporting finished."),  _u8L("Eject drive.") },
 		{NotificationType::Mouse3dDisconnected, NotificationLevel::RegularNotification, 10,  _u8L("3D Mouse disconnected.") },
 		{NotificationType::Mouse3dConnected, NotificationLevel::RegularNotification, 5,  _u8L("3D Mouse connected.") },
 		{NotificationType::NewPresetsAviable, NotificationLevel::ImportantNotification, 20,  _u8L("New Presets are available."),  _u8L("See here.") },
-		{NotificationType::PresetUpdateAviable, NotificationLevel::ImportantNotification, 20,  _u8L("Configuration update is available."),  _u8L("See more.")},
+		{NotificationType::PresetUpdateAvailable, NotificationLevel::ImportantNotification, 20,  _u8L("Configuration update is available."),  _u8L("See more.")},
 		{NotificationType::NewAppAviable, NotificationLevel::ImportantNotification, 20,  _u8L("New version is available."),  _u8L("See Releases page.")},
 		//{NotificationType::NewAppAviable, NotificationLevel::ImportantNotification, 20,  _u8L("New vesion of PrusaSlicer is available.",  _u8L("Download page.") },
 		//{NotificationType::LoadingFailed, NotificationLevel::RegularNotification, 20,  _u8L("Loading of model has Failed") },
diff --git a/src/slic3r/GUI/Plater.cpp b/src/slic3r/GUI/Plater.cpp
index ae6ebf9123..f3e6fdd37f 100644
--- a/src/slic3r/GUI/Plater.cpp
+++ b/src/slic3r/GUI/Plater.cpp
@@ -2023,7 +2023,7 @@ Plater::priv::priv(Plater *q, MainFrame *main_frame)
 #endif // ENABLE_GCODE_VIEWER
         this->q->Bind(EVT_EJECT_DRIVE_NOTIFICAION_CLICKED, [this](EjectDriveNotificationClickedEvent&) { this->q->eject_drive(); });
         this->q->Bind(EVT_EXPORT_GCODE_NOTIFICAION_CLICKED, [this](ExportGcodeNotificationClickedEvent&) { this->q->export_gcode(true); });
-        this->q->Bind(EVT_PRESET_UPDATE_AVIABLE_CLICKED, [this](PresetUpdateAviableClickedEvent&) {  wxGetApp().get_preset_updater()->on_update_notification_confirm(); });
+        this->q->Bind(EVT_PRESET_UPDATE_AVAILABLE_CLICKED, [this](PresetUpdateAvailableClickedEvent&) {  wxGetApp().get_preset_updater()->on_update_notification_confirm(); });
 	    this->q->Bind(EVT_REMOVABLE_DRIVE_EJECTED, [this, q](RemovableDriveEjectEvent &evt) {
 		    if (evt.data.second) {
 			    this->show_action_buttons(this->ready_to_slice);
diff --git a/src/slic3r/Utils/PresetUpdater.cpp b/src/slic3r/Utils/PresetUpdater.cpp
index 14b9fb0c4a..b424bafc4e 100644
--- a/src/slic3r/Utils/PresetUpdater.cpp
+++ b/src/slic3r/Utils/PresetUpdater.cpp
@@ -826,7 +826,7 @@ PresetUpdater::UpdateResult PresetUpdater::config_update(const Semver& old_slic3
 			}
 		} else {
 			p->set_waiting_updates(updates);
-			GUI::wxGetApp().plater()->get_notification_manager()->push_notification(GUI::NotificationType::PresetUpdateAviable, *(GUI::wxGetApp().plater()->get_current_canvas3D()));
+			GUI::wxGetApp().plater()->get_notification_manager()->push_notification(GUI::NotificationType::PresetUpdateAvailable, *(GUI::wxGetApp().plater()->get_current_canvas3D()));
 		}
 		
 		// MsgUpdateConfig will show after the notificaation is clicked