diff --git a/Profiles/CueProfile.cs b/Profiles/CueProfile.cs
index 638ae32..8c5a2fd 100644
--- a/Profiles/CueProfile.cs
+++ b/Profiles/CueProfile.cs
@@ -2,6 +2,7 @@
 // ReSharper disable UnusedAutoPropertyAccessor.Global
 // ReSharper disable UnusedMember.Global
 
+using System;
 using System.Collections.Generic;
 using System.IO;
 using System.Linq;
@@ -13,6 +14,7 @@ namespace CUE.NET.Profiles
     /// <summary>
     /// Represents a CUE profile.
     /// </summary>
+    [Obsolete("Only works with CUE 1.")]
     public class CueProfile
     {
         #region Properties & Fields
diff --git a/Profiles/CueProfileDevice.cs b/Profiles/CueProfileDevice.cs
index eda8958..5fb756f 100644
--- a/Profiles/CueProfileDevice.cs
+++ b/Profiles/CueProfileDevice.cs
@@ -1,4 +1,5 @@
-using System.Collections.Generic;
+using System;
+using System.Collections.Generic;
 using System.Linq;
 using System.Xml.Linq;
 using CUE.NET.Brushes;
@@ -8,6 +9,7 @@ namespace CUE.NET.Profiles
     /// <summary>
     /// Represents a device of a CUE profile.
     /// </summary>
+    [Obsolete("Only works with CUE 1.")]
     internal class CueProfileDevice
     {
         #region Properties & Fields
diff --git a/Profiles/CueProfileMode.cs b/Profiles/CueProfileMode.cs
index c2aa7bb..b6fc0b2 100644
--- a/Profiles/CueProfileMode.cs
+++ b/Profiles/CueProfileMode.cs
@@ -12,6 +12,7 @@ namespace CUE.NET.Profiles
     /// <summary>
     /// Represents a mode of a CUE profile.
     /// </summary>
+    [Obsolete("Only works with CUE 1.")]
     internal class CueProfileMode
     {
         #region Properties & Fields
diff --git a/Profiles/CueProfiles.cs b/Profiles/CueProfiles.cs
index 144220c..b04e4c3 100644
--- a/Profiles/CueProfiles.cs
+++ b/Profiles/CueProfiles.cs
@@ -12,6 +12,7 @@ namespace CUE.NET.Profiles
     /// <summary>
     /// Represents the SDK for CUE profiles.
     /// </summary>
+    [Obsolete("Only works with CUE 1.")]
     public static class CueProfiles
     {
         #region Constants