diff --git a/Source/OpenTK/Math/Vector4.cs b/Source/OpenTK/Math/Vector4.cs
index c90f3882..f3f09e81 100644
--- a/Source/OpenTK/Math/Vector4.cs
+++ b/Source/OpenTK/Math/Vector4.cs
@@ -130,6 +130,19 @@ namespace OpenTK.Math
             W = 0.0f;
         }
 
+        /// <summary>
+        /// Constructs a new Vector4 from the specified Vector3 and W component.
+        /// </summary>
+        /// <param name="v">The Vector3 to copy components from.</param>
+        /// <param name="w">The W component of the new Vector4.</param>
+        public Vector4(Vector3 v, float w)
+        {
+            X = v.X;
+            Y = v.Y;
+            Z = v.Z;
+            W = w;
+        }
+
         /// <summary>
         /// Constructs a new Vector4 from the given Vector4.
         /// </summary>
@@ -812,6 +825,14 @@ namespace OpenTK.Math
 
         #endregion
 
+        #region Swizzle
+
+        public Vector2 Xy { get { return new Vector2(X, Y); } set { X = value.X; Y = value.Y; } }
+
+        public Vector3 Xyz { get { return new Vector3(X, Y, Z); } set { X = value.X; Y = value.Y; Z = value.Z; } }
+
+        #endregion
+
         #region Operators
 
         public static Vector4 operator +(Vector4 left, Vector4 right)
diff --git a/Source/OpenTK/Math/Vector4d.cs b/Source/OpenTK/Math/Vector4d.cs
index 1db2bdde..29d1694d 100644
--- a/Source/OpenTK/Math/Vector4d.cs
+++ b/Source/OpenTK/Math/Vector4d.cs
@@ -104,10 +104,10 @@ namespace OpenTK.Math
         }
 
         /// <summary>
-        /// Constructs a new Vector4d from the given Vector2.
+        /// Constructs a new Vector4d from the given Vector2d.
         /// </summary>
-        /// <param name="v">The Vector2 to copy components from.</param>
-        public Vector4d(Vector2 v)
+        /// <param name="v">The Vector2d to copy components from.</param>
+        public Vector4d(Vector2d v)
         {
             X = v.X;
             Y = v.Y;
@@ -116,10 +116,10 @@ namespace OpenTK.Math
         }
 
         /// <summary>
-        /// Constructs a new Vector4d from the given Vector3.
+        /// Constructs a new Vector4d from the given Vector3d.
         /// </summary>
-        /// <param name="v">The Vector3 to copy components from.</param>
-        public Vector4d(Vector3 v)
+        /// <param name="v">The Vector3d to copy components from.</param>
+        public Vector4d(Vector3d v)
         {
             X = v.X;
             Y = v.Y;
@@ -127,6 +127,19 @@ namespace OpenTK.Math
             W = 0.0f;
         }
 
+        /// <summary>
+        /// Constructs a new Vector4d from the specified Vector3d and W component.
+        /// </summary>
+        /// <param name="v">The Vector3d to copy components from.</param>
+        /// <param name="w">The W component of the new Vector4.</param>
+        public Vector4d(Vector3 v, double w)
+        {
+            X = v.X;
+            Y = v.Y;
+            Z = v.Z;
+            W = w;
+        }
+
         /// <summary>
         /// Constructs a new Vector4d from the given Vector4d.
         /// </summary>