diff --git a/NewHorizons/External/Modules/AtmosphereModule.cs b/NewHorizons/External/Modules/AtmosphereModule.cs
index 543776ea..8cbff64a 100644
--- a/NewHorizons/External/Modules/AtmosphereModule.cs
+++ b/NewHorizons/External/Modules/AtmosphereModule.cs
@@ -1,5 +1,6 @@
 using System;
 using System.ComponentModel;
+using System.ComponentModel.DataAnnotations;
 using System.Runtime.Serialization;
 using NewHorizons.Utility;
 using Newtonsoft.Json;
@@ -36,12 +37,13 @@ namespace NewHorizons.External.Modules
         /// <summary>
         /// How dense the fog is, if you put fog.
         /// </summary>
-        // FIXME: Min & Max Needed!
+        [Range(0f, 1f)]
         public float fogDensity;
 
         /// <summary>
         /// Radius of fog sphere, independent of the atmosphere. This has to be set for there to be fog.
         /// </summary>
+        [Range(0f, float.MaxValue)]
         public float fogSize;
 
         /// <summary>
diff --git a/NewHorizons/NewHorizons.csproj b/NewHorizons/NewHorizons.csproj
index 2c5736c7..cb332645 100644
--- a/NewHorizons/NewHorizons.csproj
+++ b/NewHorizons/NewHorizons.csproj
@@ -20,6 +20,7 @@
     <NoWarn>1701;1702;1591</NoWarn> 
   </PropertyGroup>
   <ItemGroup>
+    <PackageReference Include="System.ComponentModel.Annotations" Version="5.0.0" />
     <Reference Include="..\NJsonSchema\*.dll" />
     <PackageReference Include="HarmonyX" Version="2.10.0" />
     <PackageReference Include="OWML" Version="2.3.3" />
diff --git a/NewHorizons/Utility/MColor.cs b/NewHorizons/Utility/MColor.cs
index 0600f28a..2212bac0 100644
--- a/NewHorizons/Utility/MColor.cs
+++ b/NewHorizons/Utility/MColor.cs
@@ -1,23 +1,44 @@
-using UnityEngine;
+using Newtonsoft.Json;
+using UnityEngine;
 namespace NewHorizons.Utility
 {
+    [JsonObject]
     public class MColor
     {
         public MColor(int r, int g, int b, int a)
         {
-            R = r;
-            G = g;
-            B = b;
-            A = a;
+            this.r = r;
+            this.g = g;
+            this.b = b;
+            this.a = a;
         }
 
-        public int R { get; }
-        public int G { get; }
-        public int B { get; }
-        public int A { get; } 
+        /// <summary>
+        /// The red component of this colour
+        /// </summary>
+        [System.ComponentModel.DataAnnotations.Range(0f, int.MaxValue)] 
+        public int r;
 
-        public Color32 ToColor32() => new Color32((byte)R, (byte)G, (byte)B, (byte)A);
+        /// <summary>
+        /// The green component of this colour
+        /// </summary>
+        [System.ComponentModel.DataAnnotations.Range(0f, int.MaxValue)] 
+        public int g;
+        
+        /// <summary>
+        /// The blue component of this colour
+        /// </summary>
+        [System.ComponentModel.DataAnnotations.Range(0f, int.MaxValue)] 
+        public int b;
+        
+        /// <summary>
+        /// The alpha (opacity) component of this colour
+        /// </summary>
+        [System.ComponentModel.DataAnnotations.Range(0f, int.MaxValue)] 
+        public int a;
 
-        public Color ToColor() => new Color(R / 255f, G / 255f, B / 255f, A / 255f);
+        public Color32 ToColor32() => new Color32((byte)r, (byte)g, (byte)b, (byte)a);
+
+        public Color ToColor() => new Color(r / 255f, g / 255f, b / 255f, a / 255f);
     }
 }
diff --git a/SchemaExporter/SchemaExporter.csproj b/SchemaExporter/SchemaExporter.csproj
index c1610f90..8bc3295a 100644
--- a/SchemaExporter/SchemaExporter.csproj
+++ b/SchemaExporter/SchemaExporter.csproj
@@ -25,6 +25,7 @@
         <PackageReference Include="Newtonsoft.Json.Schema" Version="3.0.14" />
         <PackageReference Include="NJsonSchema" Version="10.7.1" />
         <PackageReference Include="OuterWildsGameLibs" Version="1.1.12.168" IncludeAssets="compile" />
+        <PackageReference Include="System.ComponentModel.Annotations" Version="5.0.0" />
     </ItemGroup>
     <ItemGroup>
       <ProjectReference Include="..\NewHorizons\NewHorizons.csproj" />