diff --git a/src/SlackHelper/ISlackHelper.cs b/src/SlackHelper/ISlackHelper.cs
index 96ba96e..06f0e7b 100644
--- a/src/SlackHelper/ISlackHelper.cs
+++ b/src/SlackHelper/ISlackHelper.cs
@@ -1,4 +1,5 @@
 using System.Net.Http;
+using System.Threading;
 using System.Threading.Tasks;
 using ManxJason.SlackHelper.Attachments;
 
@@ -6,9 +7,9 @@ namespace ManxJason.SlackHelper
 {
     public interface ISlackHelper
     {
-        Task<HttpResponseMessage> SendAsync(string message);
-        Task<HttpResponseMessage> SendAsync(Attachment attachment);
-        Task<HttpResponseMessage> SendAsync(Attachment[] attachments);
-        Task<HttpResponseMessage> SendAsync(object message);
+        Task<HttpResponseMessage> SendAsync(string message, CancellationToken cancellationToken);
+        Task<HttpResponseMessage> SendAsync(Attachment attachment, CancellationToken cancellationToken);
+        Task<HttpResponseMessage> SendAsync(Attachment[] attachments, CancellationToken cancellationToken);
+        Task<HttpResponseMessage> SendAsync(object message, CancellationToken cancellationToken);
     }
 }
\ No newline at end of file
diff --git a/src/SlackHelper/SlackHelper.cs b/src/SlackHelper/SlackHelper.cs
index 73d2319..1ab7d54 100644
--- a/src/SlackHelper/SlackHelper.cs
+++ b/src/SlackHelper/SlackHelper.cs
@@ -1,6 +1,7 @@
 using System;
 using System.Net.Http;
 using System.Text;
+using System.Threading;
 using System.Threading.Tasks;
 using ManxJason.SlackHelper.Attachments;
 using Newtonsoft.Json;
@@ -15,33 +16,40 @@ public sealed class SlackHelper : ISlackHelper
         private readonly Uri _incomingWebHook;
 
         /// <summary>
-        /// Obtain the incoming webhook from your Slack configuration options.
+        /// Obtain the incoming web hook from your Slack configuration options.
         /// </summary>
         /// <param name="incomingWebHook"></param>
         public SlackHelper(Uri incomingWebHook) =>
             _incomingWebHook = incomingWebHook ?? throw new ArgumentNullException();
 
         /// <summary>
-        /// Send a regular string value via webhook.
+        /// Send a regular string value via web hook.
         /// </summary>
         /// <param name="message">Plain old text value.</param>
+        /// <param name="cancellationToken"></param>
         /// <returns></returns>
-        public async Task<HttpResponseMessage> SendAsync(string message) =>
-            await PostToSlack(
+        public async Task<HttpResponseMessage> SendAsync(
+            string message,
+            CancellationToken cancellationToken = default(CancellationToken)) =>
+            await PostToSlackAsync(
                     _incomingWebHook,
                     new
                     {
                         text = message
-                    })
+                    },
+                    cancellationToken)
                 .ConfigureAwait(false);
 
         /// <summary>
-        /// Send a single attachment via webhook.
+        /// Send a single attachment via web hook.
         /// </summary>
         /// <param name="attachment"></param>
+        /// <param name="cancellationToken"></param>
         /// <returns></returns>
-        public async Task<HttpResponseMessage> SendAsync(Attachment attachment) =>
-            await PostToSlack(
+        public async Task<HttpResponseMessage> SendAsync(
+            Attachment attachment,
+            CancellationToken cancellationToken = default(CancellationToken)) =>
+            await PostToSlackAsync(
                     _incomingWebHook,
                     new AttachmentsContainer
                     {
@@ -49,32 +57,43 @@ await PostToSlack(
                         {
                             attachment
                         }
-                    })
+                    },
+                    cancellationToken)
                 .ConfigureAwait(false);
 
         /// <summary>
-        /// Send an array of attachments via webhook.
+        /// Send an array of attachments via web hook.
         /// </summary>
         /// <param name="attachments"></param>
+        /// <param name="cancellationToken"></param>
         /// <returns></returns>
-        public async Task<HttpResponseMessage> SendAsync(Attachment[] attachments) =>
-            await PostToSlack(
+        public async Task<HttpResponseMessage> SendAsync(
+            Attachment[] attachments,
+            CancellationToken cancellationToken = default(CancellationToken)) =>
+            await PostToSlackAsync(
                     _incomingWebHook,
                     new AttachmentsContainer
                     {
                         Attachments = attachments
-                    })
+                    },
+                    cancellationToken)
                 .ConfigureAwait(false);
 
         /// <summary>
-        /// Build your own anonymous object following Slack documentation to send your customised message.
+        /// Build your own anonymous object following Slack documentation to send your customized message.
         /// </summary>
         /// <param name="message"></param>
+        /// <param name="cancellationToken"></param>
         /// <returns>HttpResponse</returns>
-        public Task<HttpResponseMessage> SendAsync(object message) =>
-            PostToSlack(_incomingWebHook, message);
+        public Task<HttpResponseMessage> SendAsync(
+            object message,
+            CancellationToken cancellationToken = default(CancellationToken)) =>
+            PostToSlackAsync(_incomingWebHook, message, cancellationToken);
 
-        private static async Task<HttpResponseMessage> PostToSlack(Uri slackHook, object content)
+        private static async Task<HttpResponseMessage> PostToSlackAsync(
+            Uri slackHook,
+            object content,
+            CancellationToken cancellationToken = default(CancellationToken))
         {
             using (HttpClient client = new HttpClient())
             {
@@ -91,7 +110,7 @@ private static async Task<HttpResponseMessage> PostToSlack(Uri slackHook, object
                     });
                 StringContent stringContent = new StringContent(serializeObject, Encoding.UTF8, "application/json");
 
-                return await client.PostAsync(slackHook, stringContent).ConfigureAwait(false);
+                return await client.PostAsync(slackHook, stringContent, cancellationToken).ConfigureAwait(false);
             }
         }
     }
diff --git a/src/SlackHelper/SlackHelper.csproj b/src/SlackHelper/SlackHelper.csproj
index 531a319..b5df434 100644
--- a/src/SlackHelper/SlackHelper.csproj
+++ b/src/SlackHelper/SlackHelper.csproj
@@ -5,7 +5,7 @@
     <TargetFramework>netstandard2.0</TargetFramework>
     <AssemblyName>ManxJason.SlackHelper</AssemblyName>
     <RootNamespace>ManxJason.SlackHelper</RootNamespace>
-    <Version>0.0.3</Version>
+    <Version>0.0.4</Version>
     <Authors>Jason Callister</Authors>
     <Company>Jason Callister</Company>
     <Description>Lightweight .Net Standard library for posting Slack messages or attachments via webhook integration</Description>
@@ -14,7 +14,7 @@
     <Copyright>https://github.com/manxjason/SlackHelper/blob/master/LICENSE</Copyright>
     <PackageProjectUrl>https://github.com/manxjason/SlackHelper</PackageProjectUrl>
     <RepositoryUrl>https://github.com/manxjason/SlackHelper</RepositoryUrl>
-    <PackageReleaseNotes>Basic webhook functionality only.</PackageReleaseNotes>
+    <PackageReleaseNotes>Added cancellation tokens</PackageReleaseNotes>
     <GeneratePackageOnBuild>true</GeneratePackageOnBuild>
   </PropertyGroup>