foo.diff

diff --git a/src/CoreGraphics/CGDisplay.cs b/src/CoreGraphics/CGDisplay.cs
index 6bfad44f8..8fdef17be 100644
--- a/src/CoreGraphics/CGDisplay.cs
+++ b/src/CoreGraphics/CGDisplay.cs
@@ -167,6 +167,23 @@ namespace CoreGraphics
 		public static int ShieldingWindowLevel {
 			get { return CGShieldingWindowLevel (); }
 		}
+
+		[DllImport (Constants.CoreGraphicsLibrary)]
+		extern static IntPtr CGDisplayCopyDisplayMode (uint display);
+
+		[DllImport (Constants.CoreGraphicsLibrary)]
+		extern static void CGDisplayModeRelease (IntPtr mode);
+
+		[DllImport (Constants.CoreGraphicsLibrary)]
+		extern static double CGDisplayModeGetRefreshRate (IntPtr mode);
+
+		public static double RefreshRate (int display)
+		{
+			IntPtr mode = CGDisplayCopyDisplayMode((uint)display);
+			double refreshRate = CGDisplayModeGetRefreshRate (mode);
+			CGDisplayModeRelease (mode);
+			return refreshRate;
+		}
 #endif
 	}
 }