diff --git a/includes/xna/common/collision.hpp b/includes/xna/common/collision.hpp
index b4872ac..1d49d7b 100644
--- a/includes/xna/common/collision.hpp
+++ b/includes/xna/common/collision.hpp
@@ -73,6 +73,26 @@ namespace xna {
 		listff det = listff(16, listf(4));
 	};
 
+	//Describes the intersection between a plane and a bounding volume.
+	enum class PlaneIntersectionType {
+		//There is no intersection, and the bounding volume is in the positive half-space of the Plane.
+		Front,
+		//There is no intersection, and the bounding volume is in the negative half - space of the Plane.
+		Back,
+		//The Plane is intersected.
+		Intersecting,
+	};
+
+	//Indicates the extent to which bounding volumes intersect or contain one another. 
+	enum class ContainmentType {
+		//Indicates there is no overlap between the bounding volumes.
+		Disjoint,
+		//Indicates that one bounding volume completely contains the other.
+		Contains,
+		//Indicates that the bounding volumes partially overlap.
+		Intersects,
+	};
+
 	//Defines a plane. 
 	struct Plane {
 		//The normal vector of the Plane.
diff --git a/includes/xna/enumerations.hpp b/includes/xna/enumerations.hpp
index 9d993a0..3eff07a 100644
--- a/includes/xna/enumerations.hpp
+++ b/includes/xna/enumerations.hpp
@@ -93,13 +93,7 @@ namespace xna {
         Alpha,
         All,
         None
-    };
-
-    enum class ContainmentType {
-        Disjoint,
-        Contains,
-        Intersects,
-    };
+    };    
 
     enum class ComparisonFunction {
         Never,
@@ -187,13 +181,7 @@ namespace xna {
         //Use the largest available set of graphic features and capabilities to target devices,
         //such as an Xbox 360 console and a Windows-based computer, that have more enhanced graphic capabilities. 
         HiDef
-    };
-
-    enum class PlaneIntersectionType {
-        Front,
-        Back,
-        Intersecting,
-    };
+    };    
 
     enum class PlayerIndex
     {