diff --git a/Ntp.Analyzer.Validate.Cli/Program.cs b/Ntp.Analyzer.Validate.Cli/Program.cs
index fa6a8b13..a29f8584 100644
--- a/Ntp.Analyzer.Validate.Cli/Program.cs
+++ b/Ntp.Analyzer.Validate.Cli/Program.cs
@@ -41,12 +41,18 @@ namespace Ntp.Analyzer.Validate.Cli
         public static void Main (string[] args)
         {
             if (args.Length != 1) {
+                Console.WriteLine("NTP Analyzer validator tool.");
                 Console.WriteLine ("Usage: ntpav configuration");
                 return;
             }
 
             string configFile = args [0];
 
+            if (!File.Exists (configFile)) {
+                Console.WriteLine("File does not exists: " + configFile);
+                return;
+            }
+
             // Neutralize.
             Thread.CurrentThread.CurrentCulture = CultureInfo.InvariantCulture;
 
diff --git a/Ntp.Monitor.Cli/Program.cs b/Ntp.Monitor.Cli/Program.cs
index c353e58b..0cffe69e 100644
--- a/Ntp.Monitor.Cli/Program.cs
+++ b/Ntp.Monitor.Cli/Program.cs
@@ -34,6 +34,11 @@ namespace Ntp.Monitor.Cli
     {
         public static void Main(string[] args)
         {
+            if (args.Length != 3) {
+                ShowUsage();
+                return;
+            }
+
             IPAddress address;
 
             if (!IPAddress.TryParse(args[0], out address))
@@ -62,6 +67,7 @@ namespace Ntp.Monitor.Cli
 
         private static void ShowUsage()
         {
+            Console.WriteLine("NTP Analyzer command query tool.");
             Console.WriteLine("Usage: ntpac host port command");
         }
     }