diff --git a/src/BirdsiteLive.ActivityPub/Models/Actor.cs b/src/BirdsiteLive.ActivityPub/Models/Actor.cs
index 0552f25..886b862 100644
--- a/src/BirdsiteLive.ActivityPub/Models/Actor.cs
+++ b/src/BirdsiteLive.ActivityPub/Models/Actor.cs
@@ -23,5 +23,6 @@ namespace BirdsiteLive.ActivityPub
         public Image icon { get; set; }
         public Image image { get; set; }
         public EndPoints endpoints { get; set; }
+        public UserAttachment[] attachment { get; set; }
     }
 }
diff --git a/src/BirdsiteLive.ActivityPub/Models/UserAttachment.cs b/src/BirdsiteLive.ActivityPub/Models/UserAttachment.cs
new file mode 100644
index 0000000..1b7df37
--- /dev/null
+++ b/src/BirdsiteLive.ActivityPub/Models/UserAttachment.cs
@@ -0,0 +1,9 @@
+namespace BirdsiteLive.ActivityPub
+{
+    public class UserAttachment
+    {
+        public string type { get; set; }
+        public string name { get; set; }
+        public string value { get; set; }
+    }
+}
\ No newline at end of file
diff --git a/src/BirdsiteLive.Domain/UserService.cs b/src/BirdsiteLive.Domain/UserService.cs
index c203977..549e0ea 100644
--- a/src/BirdsiteLive.Domain/UserService.cs
+++ b/src/BirdsiteLive.Domain/UserService.cs
@@ -75,6 +75,15 @@ namespace BirdsiteLive.Domain
                     mediaType = "image/jpeg",
                     url = twitterUser.ProfileBannerURL
                 },
+                attachment = new []
+                {
+                    new UserAttachment
+                    {
+                        type = "PropertyValue",
+                        name = "Official",
+                        value = $"<a href=\"https://twitter.com/{acct}\" rel=\"me nofollow noopener noreferrer\" target=\"_blank\"><span class=\"invisible\">https://</span><span class=\"ellipsis\">twitter.com/{acct}</span></a>"
+                    }
+                },
                 endpoints = new EndPoints
                 {
                     sharedInbox = $"https://{_instanceSettings.Domain}/inbox"
diff --git a/src/BirdsiteLive/BirdsiteLive.csproj b/src/BirdsiteLive/BirdsiteLive.csproj
index b20520f..d6851c5 100644
--- a/src/BirdsiteLive/BirdsiteLive.csproj
+++ b/src/BirdsiteLive/BirdsiteLive.csproj
@@ -4,7 +4,7 @@
     <TargetFramework>netcoreapp3.1</TargetFramework>
     <UserSecretsId>d21486de-a812-47eb-a419-05682bb68856</UserSecretsId>
     <DockerDefaultTargetOS>Linux</DockerDefaultTargetOS>
-    <Version>0.3.3</Version>
+    <Version>0.4.0</Version>
   </PropertyGroup>
 
   <ItemGroup>
diff --git a/src/BirdsiteLive/Controllers/UsersController.cs b/src/BirdsiteLive/Controllers/UsersController.cs
index 78941d5..ca222ae 100644
--- a/src/BirdsiteLive/Controllers/UsersController.cs
+++ b/src/BirdsiteLive/Controllers/UsersController.cs
@@ -39,8 +39,12 @@ namespace BirdsiteLive.Controllers
         [Route("/users")]
         public IActionResult Index()
         {
-            var r = Request.Headers["Accept"].First();
-            if (r.Contains("application/activity+json")) return NotFound();
+            var acceptHeaders = Request.Headers["Accept"];
+            if (acceptHeaders.Any())
+            {
+                var r = acceptHeaders.First();
+                if (r.Contains("application/activity+json")) return NotFound();
+            }
             return View("UserNotFound");
         }
 
@@ -48,16 +52,20 @@ namespace BirdsiteLive.Controllers
         [Route("/users/{id}")]
         public IActionResult Index(string id)
         {
-            id = id.Trim(new[] {' ', '@'}).ToLowerInvariant();
+            id = id.Trim(new[] { ' ', '@' }).ToLowerInvariant();
             var user = _twitterService.GetUser(id);
 
-            var r = Request.Headers["Accept"].First();
-            if (r.Contains("application/activity+json"))
+            var acceptHeaders = Request.Headers["Accept"];
+            if (acceptHeaders.Any())
             {
-                if (user == null) return NotFound();
-                var apUser = _userService.GetUser(user);
-                var jsonApUser = JsonConvert.SerializeObject(apUser);
-                return Content(jsonApUser, "application/activity+json; charset=utf-8");
+                var r = acceptHeaders.First();
+                if (r.Contains("application/activity+json"))
+                {
+                    if (user == null) return NotFound();
+                    var apUser = _userService.GetUser(user);
+                    var jsonApUser = JsonConvert.SerializeObject(apUser);
+                    return Content(jsonApUser, "application/activity+json; charset=utf-8");
+                }
             }
 
             if (user == null) return View("UserNotFound");
@@ -79,22 +87,26 @@ namespace BirdsiteLive.Controllers
         [Route("/users/{id}/statuses/{statusId}")]
         public IActionResult Tweet(string id, string statusId)
         {
-            var r = Request.Headers["Accept"].First();
-            if (r.Contains("application/activity+json"))
+            var acceptHeaders = Request.Headers["Accept"];
+            if (acceptHeaders.Any())
             {
-                if (!long.TryParse(statusId, out var parsedStatusId))
-                    return NotFound();
+                var r = acceptHeaders.First();
+                if (r.Contains("application/activity+json"))
+                {
+                    if (!long.TryParse(statusId, out var parsedStatusId))
+                        return NotFound();
 
-                var tweet = _twitterService.GetTweet(parsedStatusId);
-                if (tweet == null)
-                    return NotFound();
+                    var tweet = _twitterService.GetTweet(parsedStatusId);
+                    if (tweet == null)
+                        return NotFound();
 
-                //var user = _twitterService.GetUser(id);
-                //if (user == null) return NotFound();
+                    //var user = _twitterService.GetUser(id);
+                    //if (user == null) return NotFound();
 
-                var status = _statusService.GetStatus(id, tweet);
-                var jsonApUser = JsonConvert.SerializeObject(status);
-                return Content(jsonApUser, "application/activity+json; charset=utf-8");
+                    var status = _statusService.GetStatus(id, tweet);
+                    var jsonApUser = JsonConvert.SerializeObject(status);
+                    return Content(jsonApUser, "application/activity+json; charset=utf-8");
+                }
             }
 
             return View("Tweet", statusId);