fix #506

Author: jonsequitur

src/System.CommandLine.Tests/Help/HelpBuilderTests.cs

@@ -1106,6 +1106,21 @@ public void Required_options_are_indicated_when_argument_is_named()
                 .Contain("-r, --required <ARG> (REQUIRED)");
         }
 
+        [Fact]
+        public void Help_option_is_shown_in_help()
+        {
+            var parser = new CommandLineBuilder()
+                         .UseHelp()
+                         .Build();
+
+            _helpBuilder.Write(parser.Configuration.RootCommand);
+
+            var help = _console.Out.ToString();
+
+            help.Should()
+                .Contain($"--help{_columnPadding}Show help and usage information");
+        }
+
         #endregion Options
 
         #region Subcommands

src/System.CommandLine.Tests/VersionOptionTests.cs

@@ -66,7 +66,7 @@ public async Task Version_option_appears_in_help()
             console.Out
                    .ToString()
                    .Should()
-                   .Match("*Options:*--version*Display version information*");
+                   .Match("*Options:*--version*Show version information*");
         }
 
         [Fact]

src/System.CommandLine/Builder/CommandLineBuilderExtensions.cs

@@ -275,7 +275,7 @@ public static CommandLineBuilder UseHelp(this CommandLineBuilder builder)
                 "--help",
                 "-?",
                 "/?"
-            });
+            }, "Show help and usage information");
 
             return builder.UseHelp(helpOption);
         }
@@ -428,7 +428,7 @@ public static CommandLineBuilder UseVersionOption(
                 return builder;
             }
 
-            var versionOption = new Option("--version", "Display version information");
+            var versionOption = new Option("--version", "Show version information");
 
             builder.AddOption(versionOption);