diff --git a/OSBindings/Mac/Clock Signal/AppDelegate.swift b/OSBindings/Mac/Clock Signal/AppDelegate.swift
index 80bdf4c87..acaa180ab 100644
--- a/OSBindings/Mac/Clock Signal/AppDelegate.swift	
+++ b/OSBindings/Mac/Clock Signal/AppDelegate.swift	
@@ -17,7 +17,7 @@ class AppDelegate: NSObject, NSApplicationDelegate {
 		// that this project supports reascends to 10.14.
 		if (MTLCopyAllDevices().count == 0) {
 			let alert = NSAlert()
-			alert.messageText = "This application requires a Metal-capable GPU"
+			alert.messageText = "This application requires a Metal-capable GPU."
 			alert.addButton(withTitle: "Quit")
 			alert.runModal()