diff --git a/src/CommandLine/Error.cs b/src/CommandLine/Error.cs
index 2f208dec..0c2095d9 100644
--- a/src/CommandLine/Error.cs
+++ b/src/CommandLine/Error.cs
@@ -241,7 +241,7 @@ internal BadFormatTokenError(string token)
     }
 
     /// <summary>
-    /// Base type of all erros with name information.
+    /// Base type of all errors with name information.
     /// </summary>
     public abstract class NamedError : Error, IEquatable<NamedError>
     {
@@ -498,7 +498,7 @@ internal SetValueExceptionError(NameInfo nameInfo, Exception exception, object v
         }
 
         /// <summary>
-        /// The expection thrown from Property.SetValue
+        /// The exception thrown from Property.SetValue
         /// </summary>
         public Exception Exception
         {
diff --git a/src/CommandLine/Infrastructure/Either.cs b/src/CommandLine/Infrastructure/Either.cs
index 71666dc2..44a5cba5 100644
--- a/src/CommandLine/Infrastructure/Either.cs
+++ b/src/CommandLine/Infrastructure/Either.cs
@@ -17,7 +17,7 @@ enum EitherType
         /// </summary>
         Left,
         /// <summary>
-        /// Sccessful computation case.
+        /// Successful computation case.
         /// </summary>
         Right
     }
@@ -319,4 +319,4 @@ public static bool IsRight<TLeft, TRight>(this Either<TLeft, TRight> either)
             return either.Tag == EitherType.Right;
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/CommandLine/Infrastructure/ErrorHandling.cs b/src/CommandLine/Infrastructure/ErrorHandling.cs
index 142e1461..c73b3824 100644
--- a/src/CommandLine/Infrastructure/ErrorHandling.cs
+++ b/src/CommandLine/Infrastructure/ErrorHandling.cs
@@ -1,7 +1,7 @@
 //Use project level define(s) when referencing with Paket.
 //#define ERRH_INTERNAL // Uncomment this to set visibility to internal.
 //#define ERRH_DISABLE_INLINE_METHODS // Uncomment this to enable method inlining when compiling for >= NET 4.5.
-//#define ERRH_BUILTIN_TYPES // Uncomment this to use built-in Unit type, instead of extenral identical CSharpx.Unit.
+//#define ERRH_BUILTIN_TYPES // Uncomment this to use built-in Unit type, instead of external identical CSharpx.Unit.
 
 using System;
 using System.Collections.Generic;
@@ -345,7 +345,7 @@ public static Result<TSuccess, TMessage> MergeMessages<TSuccess, TMessage>(
 
         /// <summary>
         /// If the result is a Success it executes the given function on the value.
-        /// Otherwise the exisiting failure is propagated.
+        /// Otherwise the existing failure is propagated.
         /// </summary>
 #if !ERRH_DISABLE_INLINE_METHODS
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -377,7 +377,7 @@ public static Result<TSuccess, TMessage> Flatten<TSuccess, TMessage>(
 
         /// <summary>
         /// If the wrapped function is a success and the given result is a success the function is applied on the value. 
-        /// Otherwise the exisiting error messages are propagated.
+        /// Otherwise the existing error messages are propagated.
         /// </summary>
 #if !ERRH_DISABLE_INLINE_METHODS
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -579,7 +579,7 @@ public static Result<IEnumerable<TSuccess>, TMessage> Flatten<TSuccess, TMessage
 
         /// <summary>
         /// If the result is a Success it executes the given Func on the value.
-        /// Otherwise the exisiting failure is propagated.
+        /// Otherwise the existing failure is propagated.
         /// </summary>
 #if !ERRH_DISABLE_INLINE_METHODS
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -593,7 +593,7 @@ public static Result<TResult, TMessage> SelectMany<TSuccess, TMessage, TResult>(
         /// <summary>
         /// If the result is a Success it executes the given Func on the value.
         /// If the result of the Func is a Success it maps it using the given Func.
-        /// Otherwise the exisiting failure is propagated.
+        /// Otherwise the existing failure is propagated.
         /// </summary>
 #if !ERRH_DISABLE_INLINE_METHODS
         [MethodImpl(MethodImplOptions.AggressiveInlining)]
@@ -664,4 +664,4 @@ public static TSuccess SucceededWith<TSuccess, TMessage>(this Result<TSuccess, T
                 string.Join(Environment.NewLine, bad.Messages.Select(m => m.ToString()))));
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/CommandLine/Infrastructure/Maybe.cs b/src/CommandLine/Infrastructure/Maybe.cs
index 63451865..4122906e 100644
--- a/src/CommandLine/Infrastructure/Maybe.cs
+++ b/src/CommandLine/Infrastructure/Maybe.cs
@@ -296,7 +296,7 @@ public static Maybe<TResult> SelectMany<TSource, TValue, TResult>(
 
         #region Do Semantic
         /// <summary>
-        /// If contans a value executes an <see cref="System.Action{T}"/> delegate over it.
+        /// If contains a value executes an <see cref="System.Action{T}"/> delegate over it.
         /// </summary>
         public static void Do<T>(this Maybe<T> maybe, Action<T> action)
         {
@@ -308,7 +308,7 @@ public static void Do<T>(this Maybe<T> maybe, Action<T> action)
         }
 
         /// <summary>
-        /// If contans a value executes an <see cref="System.Action{T1, T2}"/> delegate over it.
+        /// If contains a value executes an <see cref="System.Action{T1, T2}"/> delegate over it.
         /// </summary>
         public static void Do<T1, T2>(this Maybe<Tuple<T1, T2>> maybe, Action<T1, T2> action)
         {
@@ -394,4 +394,4 @@ public static IEnumerable<T> ToEnumerable<T>(this Maybe<T> maybe)
             return Enumerable.Empty<T>();
         }
     }
-}
\ No newline at end of file
+}
diff --git a/src/CommandLine/NullInstance.cs b/src/CommandLine/NullInstance.cs
index c2ebd77a..820a2f30 100644
--- a/src/CommandLine/NullInstance.cs
+++ b/src/CommandLine/NullInstance.cs
@@ -3,10 +3,10 @@
 namespace CommandLine
 {
     /// <summary>
-    /// Models a null result when constructing a <see cref="ParserResult{T}"/> in a faling verbs scenario.
+    /// Models a null result when constructing a <see cref="ParserResult{T}"/> in a failing verbs scenario.
     /// </summary>
     public sealed class NullInstance
     {
         internal NullInstance() { }
     }
-}
\ No newline at end of file
+}
diff --git a/src/CommandLine/Text/HelpText.cs b/src/CommandLine/Text/HelpText.cs
index b23bb804..52aa6718 100644
--- a/src/CommandLine/Text/HelpText.cs
+++ b/src/CommandLine/Text/HelpText.cs
@@ -305,7 +305,7 @@ public SentenceBuilder SentenceBuilder
         /// <param name="verbsIndex">If true the output style is consistent with verb commands (no dashes), otherwise it outputs options.</param>
         /// <param name="maxDisplayWidth">The maximum width of the display.</param>
         /// <param name="comparison">a comparison lambda to order options in help text</param>
-        /// <remarks>The parameter <paramref name="verbsIndex"/> is not ontly a metter of formatting, it controls whether to handle verbs or options.</remarks>
+        /// <remarks>The parameter <paramref name="verbsIndex"/> is not only a matter of formatting, it controls whether to handle verbs or options.</remarks>
         public static HelpText AutoBuild<T>(
             ParserResult<T> parserResult,
             Func<HelpText, HelpText> onError,
diff --git a/src/CommandLine/Text/SentenceBuilder.cs b/src/CommandLine/Text/SentenceBuilder.cs
index 1c150b67..e2c35b11 100644
--- a/src/CommandLine/Text/SentenceBuilder.cs
+++ b/src/CommandLine/Text/SentenceBuilder.cs
@@ -50,7 +50,7 @@ public static SentenceBuilder Create()
         public abstract Func<bool, string> HelpCommandText { get; }
 
         /// <summary>
-        /// Get a delegate that returns the help text of vesion command.
+        /// Get a delegate that returns the help text of version command.
         /// The delegates must accept a boolean that is equal <value>true</value> for options; otherwise <value>false</value> for verbs.
         /// </summary>
         public abstract Func<bool, string> VersionCommandText { get; } 
diff --git a/src/CommandLine/UnParserExtensions.cs b/src/CommandLine/UnParserExtensions.cs
index 7db948e7..ed222a3e 100644
--- a/src/CommandLine/UnParserExtensions.cs
+++ b/src/CommandLine/UnParserExtensions.cs
@@ -58,7 +58,7 @@ public bool ShowHidden
         /// <summary>
         /// Factory method that creates an instance of <see cref="CommandLine.UnParserSettings"/> with GroupSwitches set to true.
         /// </summary>
-        /// <returns>A properly initalized <see cref="CommandLine.UnParserSettings"/> instance.</returns>
+        /// <returns>A properly initialized <see cref="CommandLine.UnParserSettings"/> instance.</returns>
         public static UnParserSettings WithGroupSwitchesOnly()
         {
             return new UnParserSettings { GroupSwitches = true };
@@ -67,7 +67,7 @@ public static UnParserSettings WithGroupSwitchesOnly()
         /// <summary>
         /// Factory method that creates an instance of <see cref="CommandLine.UnParserSettings"/> with UseEqualToken set to true.
         /// </summary>
-        /// <returns>A properly initalized <see cref="CommandLine.UnParserSettings"/> instance.</returns>
+        /// <returns>A properly initialized <see cref="CommandLine.UnParserSettings"/> instance.</returns>
         public static UnParserSettings WithUseEqualTokenOnly()
         {
             return new UnParserSettings { UseEqualToken = true };
diff --git a/tests/CommandLine.Tests/Fakes/Help_Fakes.cs b/tests/CommandLine.Tests/Fakes/Help_Fakes.cs
index cceb5331..978f77de 100644
--- a/tests/CommandLine.Tests/Fakes/Help_Fakes.cs
+++ b/tests/CommandLine.Tests/Fakes/Help_Fakes.cs
@@ -13,7 +13,7 @@ class Simple_Options_Without_HelpText
         [Option("input-file")]
         public string FileName { get; set; }
 
-        [Option("secert-option", Hidden = true, HelpText = "This is a description for a secert hidden option that should never be visibile to the user via help text.")]
+        [Option("secert-option", Hidden = true, HelpText = "This is a description for a secert hidden option that should never be visible to the user via help text.")]
         public string SecertOption { get; set; }
     }
 
@@ -25,7 +25,7 @@ class Simple_Options_With_HelpText_Set
         [Option('i', "input-file", Required = true, HelpText = "Specify input file to be processed.")]
         public string FileName { get; set; }
 
-        [Option("secert-option", Hidden = true, HelpText = "This is a description for a secert hidden option that should never be visibile to the user via help text.")]
+        [Option("secert-option", Hidden = true, HelpText = "This is a description for a secert hidden option that should never be visible to the user via help text.")]
         public string SecertOption { get; set; }
     }
 
@@ -37,7 +37,7 @@ class Simple_Options_With_HelpText_Set_To_Long_Description
         [Option("input-file", HelpText = "This is a very long description of the Input File argument that gets passed in.  It should  be passed in as a string.")]
         public string FileName { get; set; }
 
-        [Option("secert-option", Hidden =  true, HelpText = "This is a description for a secert hidden option that should never be visibile to the user via help text.")]
+        [Option("secert-option", Hidden =  true, HelpText = "This is a description for a secert hidden option that should never be visible to the user via help text.")]
         public string SecertOption { get; set; }
     }
 
@@ -49,7 +49,7 @@ class Simple_Options_With_HelpText_Set_To_Long_Description_Without_Spaces
         [Option("input-file", HelpText = "Before 012345678901234567890123456789 After")]
         public string FileName { get; set; }
 
-        [Option("secert-option", Hidden = true, HelpText = "This is a description for a secert hidden option that should never be visibile to the user via help text.")]
+        [Option("secert-option", Hidden = true, HelpText = "This is a description for a secert hidden option that should never be visible to the user via help text.")]
         public string SecertOption { get; set; }
     }
 
@@ -76,7 +76,7 @@ class Options_With_Usage_Attribute
         [Value(0, HelpText = "Value.")]
         public string Value { get; set; }
 
-        [Option("secert-option", Hidden = true, HelpText = "This is a description for a secert hidden option that should never be visibile to the user via help text.")]
+        [Option("secert-option", Hidden = true, HelpText = "This is a description for a secert hidden option that should never be visible to the user via help text.")]
         public string SecertOption { get; set; }
 
         [Usage(ApplicationAlias = "mono testapp.exe")]
@@ -99,7 +99,7 @@ public class Secert_Verb
         [Option('f', "force", SetName = "mode-f", HelpText = "Allow adding otherwise ignored files.")]
         public bool Force { get; set; }
 
-        [Option("secert-option", Hidden = true, HelpText = "This is a description for a secert hidden option that should never be visibile to the user via help text.")]
+        [Option("secert-option", Hidden = true, HelpText = "This is a description for a secert hidden option that should never be visible to the user via help text.")]
         public string SecertOption { get; set; }
     }
 
@@ -117,7 +117,7 @@ public class Add_Verb_With_Usage_Attribute
         [Value(0)]
         public string FileName { get; set; }
 
-        [Option("secert-option", Hidden = true, HelpText = "This is a description for a secert hidden option that should never be visibile to the user via help text.")]
+        [Option("secert-option", Hidden = true, HelpText = "This is a description for a secert hidden option that should never be visible to the user via help text.")]
         public string SecertOption { get; set; }
 
         [Usage(ApplicationAlias = "git")]
@@ -140,7 +140,7 @@ public class Commit_Verb_With_Usage_Attribute
         [Option("amend", HelpText = "Used to amend the tip of the current branch.")]
         public bool Amend { get; set; }
 
-        [Option("secert-option", Hidden = true, HelpText = "This is a description for a secert hidden option that should never be visibile to the user via help text.")]
+        [Option("secert-option", Hidden = true, HelpText = "This is a description for a secert hidden option that should never be visible to the user via help text.")]
         public string SecertOption { get; set; }
 
         [Usage(ApplicationAlias = "git")]
@@ -164,7 +164,7 @@ public class Clone_Verb_With_Usage_Attribute
             HelpText = "Suppress summary message.")]
         public bool Quiet { get; set; }
 
-        [Option("secert-option", Hidden = true, HelpText = "This is a description for a secert hidden option that should never be visibile to the user via help text.")]
+        [Option("secert-option", Hidden = true, HelpText = "This is a description for a secert hidden option that should never be visible to the user via help text.")]
         public string SecertOption { get; set; }
 
         [Value(0, MetaName = "URLS",