diff --git a/UptimeSharp/Components/Alert.cs b/UptimeSharp/Components/Alert.cs
index 24f1f1f..8ddd4f8 100644
--- a/UptimeSharp/Components/Alert.cs
+++ b/UptimeSharp/Components/Alert.cs
@@ -86,8 +86,14 @@ namespace UptimeSharp
     /// <param name="alertID">The alert ID.</param>
     /// <param name="cancellationToken">The cancellation token.</param>
     /// <returns></returns>
+    /// <exception cref="UptimeSharpException">Can't delete main alert</exception>
     public async Task<bool> DeleteAlert(string alertID, CancellationToken cancellationToken = default(CancellationToken))
     {
+      if (alertID.StartsWith("0"))
+      {
+        throw new UptimeSharpException("Can't delete main alert");
+      }
+
       DefaultResponse response = await Request<DefaultResponse>("deleteAlertContact", cancellationToken, new Dictionary<string, string>()
       {
         { "alertContactID", alertID }
diff --git a/UptimeSharp/Models/Alert.cs b/UptimeSharp/Models/Alert.cs
index 6c4c52f..b7817c0 100644
--- a/UptimeSharp/Models/Alert.cs
+++ b/UptimeSharp/Models/Alert.cs
@@ -47,6 +47,21 @@ namespace UptimeSharp.Models
     /// </value>
     [JsonProperty("value")]
     public string Value { get; set; }
+
+    /// <summary>
+    /// Gets a value indicating whether [is main alert].
+    /// </summary>
+    /// <value>
+    ///   <c>true</c> if [is main alert]; otherwise, <c>false</c>.
+    /// </value>
+    [JsonIgnore]
+    public bool IsMainAlert
+    {
+      get
+      {
+        return ID.StartsWith("0");
+      }
+    }
   }
 
 
diff --git a/UptimeSharp/UptimeSharp.csproj b/UptimeSharp/UptimeSharp.csproj
index e54bed7..c83bd78 100644
--- a/UptimeSharp/UptimeSharp.csproj
+++ b/UptimeSharp/UptimeSharp.csproj
@@ -68,7 +68,7 @@
       <HintPath>..\packages\Newtonsoft.Json.5.0.8\lib\portable-net40+sl4+wp7+win8\Newtonsoft.Json.dll</HintPath>
     </Reference>
     <Reference Include="PropertyChanged">
-      <HintPath>..\packages\PropertyChanged.Fody.1.43.0.0\Lib\portable-net4+sl4+wp7+win8+MonoAndroid16+MonoTouch40\PropertyChanged.dll</HintPath>
+      <HintPath>..\packages\PropertyChanged.Fody.1.43.1.0\Lib\portable-net4+sl4+wp7+win8+MonoAndroid16+MonoTouch40\PropertyChanged.dll</HintPath>
       <Private>False</Private>
     </Reference>
     <Reference Include="System.IO">