Update command line parameter description

src/WinGif/Options.cs

@@ -9,18 +9,18 @@ internal class Gif
             [Option('d', "frame-delay", HelpText = "Delay between GIF frames in milliseconds. (33ms delay between frames equals ~30fps)", Default = 1000, Required = false)]
             public int FrameDelay { get; set; }
 
-            [Option('l', "self-capture", HelpText = "Allow self capture. By default WinGif will stop capturing when the window is active.", Default = false, Required = false)]
+            [Option('l', "self-capture", HelpText = "Allow self capture. By default WinGif will stop capturing when the window is active. (Require -t WinGif)", Default = false, Required = false)]
             public bool AllowSelfCapture { get; set; }
         }
 
 
         [Verb("capture", isDefault: true, HelpText = "Create animated GIF by capturing active window.")]
         internal class Capture : Gif, ICaptureParameters 
         {
-            [Option('t', "title", HelpText = "Full or partial window title to trigger the capture of active window.", Required = true)]
+            [Option('t', "title", HelpText = "Case sensitive, full or partial window title. The capture will start when window containing this title becomes active.", Required = true)]
             public string WindowCaption { get; set; }
 
-            [Option('s', "single", HelpText = "Capture window only with given title.", Default = false, Required = false)]
+            [Option('s', "single", HelpText = "Capture only window with given title.", Default = false, Required = false)]
             public bool SingleWindow { get; set; }
 
             [Option('o', "output", HelpText = "Output GIF file name.", Required = true)]