diff --git a/modules/mono/editor/godotsharp_editor.cpp b/modules/mono/editor/godotsharp_editor.cpp
index 9e48da68c18..0ef3adfdd08 100644
--- a/modules/mono/editor/godotsharp_editor.cpp
+++ b/modules/mono/editor/godotsharp_editor.cpp
@@ -112,6 +112,21 @@ void GodotSharpEditor::_remove_create_sln_menu_option() {
 	bottom_panel_btn->show();
 }
 
+void GodotSharpEditor::_show_about_dialog() {
+
+	bool show_on_start = EDITOR_GET("mono/editor/show_info_on_start");
+	about_dialog_checkbox->set_pressed(show_on_start);
+	about_dialog->popup_centered_minsize();
+}
+
+void GodotSharpEditor::_toggle_about_dialog_on_start(bool p_enabled) {
+
+	bool show_on_start = EDITOR_GET("mono/editor/show_info_on_start");
+	if (show_on_start != p_enabled) {
+		EditorSettings::get_singleton()->set_setting("mono/editor/show_info_on_start", p_enabled);
+	}
+}
+
 void GodotSharpEditor::_menu_option_pressed(int p_id) {
 
 	switch (p_id) {
@@ -119,15 +134,37 @@ void GodotSharpEditor::_menu_option_pressed(int p_id) {
 
 			_create_project_solution();
 		} break;
+		case MENU_ABOUT_CSHARP: {
+
+			_show_about_dialog();
+		} break;
 		default:
 			ERR_FAIL();
 	}
 }
 
+void GodotSharpEditor::_notification(int p_notification) {
+
+	switch (p_notification) {
+
+		case NOTIFICATION_READY: {
+
+			bool show_info_dialog = EDITOR_GET("mono/editor/show_info_on_start");
+			if (show_info_dialog) {
+				about_dialog->set_exclusive(true);
+				_show_about_dialog();
+				// Once shown a first time, it can be seen again via the Mono menu - it doesn't have to be exclusive then.
+				about_dialog->set_exclusive(false);
+			}
+		}
+	}
+}
+
 void GodotSharpEditor::_bind_methods() {
 
 	ClassDB::bind_method(D_METHOD("_create_project_solution"), &GodotSharpEditor::_create_project_solution);
 	ClassDB::bind_method(D_METHOD("_remove_create_sln_menu_option"), &GodotSharpEditor::_remove_create_sln_menu_option);
+	ClassDB::bind_method(D_METHOD("_toggle_about_dialog_on_start"), &GodotSharpEditor::_toggle_about_dialog_on_start);
 	ClassDB::bind_method(D_METHOD("_menu_option_pressed", "id"), &GodotSharpEditor::_menu_option_pressed);
 }
 
@@ -210,6 +247,55 @@ GodotSharpEditor::GodotSharpEditor(EditorNode *p_editor) {
 	menu_button->set_text(TTR("Mono"));
 	menu_popup = menu_button->get_popup();
 
+	// TODO: Remove or edit this info dialog once Mono support is no longer in alpha
+	{
+		menu_popup->add_item(TTR("About C# support"), MENU_ABOUT_CSHARP);
+		about_dialog = memnew(AcceptDialog);
+		editor->get_gui_base()->add_child(about_dialog);
+		about_dialog->set_title("Important: C# support is not feature-complete");
+
+		// We don't use set_text() as the default AcceptDialog Label doesn't play well with the TextureRect and CheckBox
+		// we'll add. Instead we add containers and a new autowrapped Label inside.
+
+		// Main VBoxContainer (icon + label on top, checkbox at bottom)
+		VBoxContainer *about_vbc = memnew(VBoxContainer);
+		about_dialog->add_child(about_vbc);
+
+		// HBoxContainer for icon + label
+		HBoxContainer *about_hbc = memnew(HBoxContainer);
+		about_vbc->add_child(about_hbc);
+
+		TextureRect *about_icon = memnew(TextureRect);
+		about_hbc->add_child(about_icon);
+		Ref<Texture> about_icon_tex = about_icon->get_icon("NodeWarning", "EditorIcons");
+		about_icon->set_texture(about_icon_tex);
+
+		Label *about_label = memnew(Label);
+		about_hbc->add_child(about_label);
+		about_label->set_custom_minimum_size(Size2(600, 150) * EDSCALE);
+		about_label->set_v_size_flags(Control::SIZE_EXPAND_FILL);
+		about_label->set_autowrap(true);
+		String about_text =
+				String("C# support in Godot Engine is a brand new feature and a work in progress.\n") +
+				"It is at the alpha stage and thus not suitable for use in production.\n\n" +
+				"As of Godot 3.0, C# support is not feature-complete and can crash in some situations. " +
+				"Bugs and usability issues will be addressed gradually over 3.0.x and 3.x releases.\n" +
+				"The main missing feature is the ability to export games using C# assemblies - you will therefore be able to develop and run games in the editor, " +
+				"but not to share them as standalone binaries. This feature is of course high on the priority list and should be available in 3.0.1.\n\n" +
+				"If you experience issues with this Mono build, please report them on Godot's issue tracker with details about your system, Mono version, IDE, etc.:\n\n" +
+				"        https://github.com/godotengine/godot/issues\n\n" +
+				"Your critical feedback at this stage will play a great role in shaping the C# support in future releases, so thank you!";
+		about_label->set_text(about_text);
+
+		EDITOR_DEF("mono/editor/show_info_on_start", true);
+
+		// CheckBox in main container
+		about_dialog_checkbox = memnew(CheckBox);
+		about_vbc->add_child(about_dialog_checkbox);
+		about_dialog_checkbox->set_text("Show this warning when starting the editor");
+		about_dialog_checkbox->connect("toggled", this, "_toggle_about_dialog_on_start");
+	}
+
 	String sln_path = GodotSharpDirs::get_project_sln_path();
 	String csproj_path = GodotSharpDirs::get_project_csproj_path();
 
diff --git a/modules/mono/editor/godotsharp_editor.h b/modules/mono/editor/godotsharp_editor.h
index 1b83bae1cd4..81c49aec30f 100644
--- a/modules/mono/editor/godotsharp_editor.h
+++ b/modules/mono/editor/godotsharp_editor.h
@@ -44,6 +44,8 @@ class GodotSharpEditor : public Node {
 	PopupMenu *menu_popup;
 
 	AcceptDialog *error_dialog;
+	AcceptDialog *about_dialog;
+	CheckBox *about_dialog_checkbox;
 
 	ToolButton *bottom_panel_btn;
 
@@ -54,17 +56,21 @@ class GodotSharpEditor : public Node {
 	bool _create_project_solution();
 
 	void _remove_create_sln_menu_option();
+	void _show_about_dialog();
+	void _toggle_about_dialog_on_start(bool p_enabled);
 
 	void _menu_option_pressed(int p_id);
 
 	static GodotSharpEditor *singleton;
 
 protected:
+	void _notification(int p_notification);
 	static void _bind_methods();
 
 public:
 	enum MenuOptions {
-		MENU_CREATE_SLN
+		MENU_CREATE_SLN,
+		MENU_ABOUT_CSHARP,
 	};
 
 	enum ExternalEditor {