diff --git a/SeatsioDotNet.Test/Charts/CreateChartTest.cs b/SeatsioDotNet.Test/Charts/CreateChartTest.cs
index 6fb55ea..6ef23a3 100644
--- a/SeatsioDotNet.Test/Charts/CreateChartTest.cs
+++ b/SeatsioDotNet.Test/Charts/CreateChartTest.cs
@@ -59,7 +59,7 @@ public void Categories()
             var chart = Client.Charts.Create(null, null, new[]
             {
                 new Category(1, "Category 1", "#aaaaaa"),
-                new Category(2, "Category 2", "#bbbbbb"),
+                new Category(2, "Category 2", "#bbbbbb", true),
                 new Category("cat-3", "Category 3", "#cccccc")
             });
 
@@ -68,13 +68,19 @@ public void Categories()
             Assert.Equal("Untitled chart", retrievedChart.Name);
             var drawing = Client.Charts.RetrievePublishedVersion(chart.Key);
             var actualCategories = drawing.Categories;
+            
             Assert.Equal(3, actualCategories.Count);
+            
             Assert.Equal(1L, actualCategories[0].Key);
             Assert.Equal("Category 1", actualCategories[0].Label);
             Assert.Equal("#aaaaaa", actualCategories[0].Color);
+            Assert.False(actualCategories[0].Accessible);
+            
             Assert.Equal(2L, actualCategories[1].Key);
             Assert.Equal("Category 2", actualCategories[1].Label);
             Assert.Equal("#bbbbbb", actualCategories[1].Color);
+            Assert.True(actualCategories[1].Accessible);
+            
             Assert.Equal("cat-3", actualCategories[2].Key);
         }
     }
diff --git a/SeatsioDotNet.Test/Charts/UpdateChartTest.cs b/SeatsioDotNet.Test/Charts/UpdateChartTest.cs
index 5678c62..f81aab4 100644
--- a/SeatsioDotNet.Test/Charts/UpdateChartTest.cs
+++ b/SeatsioDotNet.Test/Charts/UpdateChartTest.cs
@@ -24,7 +24,7 @@ public void Categories()
         {
             var chart = Client.Charts.Create("aChart", "BOOTHS");
 
-            Client.Charts.Update(chart.Key, categories: new[] {new Category(1, "Category 1", "#aaaaaa"), new Category("cat-2", "Category 2", "#bbbbbb")});
+            Client.Charts.Update(chart.Key, categories: new[] {new Category(1, "Category 1", "#aaaaaa"), new Category("cat-2", "Category 2", "#bbbbbb", true)});
 
             Chart retrievedChart = Client.Charts.Retrieve(chart.Key);
             Assert.Equal("aChart", retrievedChart.Name);
diff --git a/SeatsioDotNet/Charts/Category.cs b/SeatsioDotNet/Charts/Category.cs
index f920eff..d6fde12 100644
--- a/SeatsioDotNet/Charts/Category.cs
+++ b/SeatsioDotNet/Charts/Category.cs
@@ -7,23 +7,26 @@ public class Category
         public object Key { get; set; }
         public string Label { get; set; }
         public string Color { get; set; }
+        public bool? Accessible { get; set; }
 
         public Category()
         {
         }
 
-        public Category(int key, string label, string color)
+        public Category(int key, string label, string color, bool? accessible = false)
         {
             Key = key;
             Label = label;
             Color = color;
+            Accessible = accessible;
         }
 
-        public Category(string key, string label, string color)
+        public Category(string key, string label, string color, bool? accessible = false)
         {
             Key = key;
             Label = label;
             Color = color;
+            Accessible = accessible;
         }
 
         public Dictionary<string, object> AsDictionary()
@@ -43,6 +46,11 @@ public Dictionary<string, object> AsDictionary()
             if (Color != null)
             {
                 dictionary.Add("color", Color);
+            }  
+            
+            if (Accessible != null)
+            {
+                dictionary.Add("accessible", Accessible);
             }
 
             return dictionary;