diff --git a/Source/OpenTK/Math/Matrix4.cs b/Source/OpenTK/Math/Matrix4.cs
index 1cec3d49..8eb5a484 100644
--- a/Source/OpenTK/Math/Matrix4.cs
+++ b/Source/OpenTK/Math/Matrix4.cs
@@ -229,7 +229,7 @@ namespace OpenTK
         public float M41 { get { return Row3.X; } set { Row3.X = value; } }
 
         /// <summary>
-        /// Gets or sets the value at row 4, column 3 of this instance.
+        /// Gets or sets the value at row 4, column 2 of this instance.
         /// </summary>
         public float M42 { get { return Row3.Y; } set { Row3.Y = value; } }
 
diff --git a/Source/OpenTK/Math/Matrix4d.cs b/Source/OpenTK/Math/Matrix4d.cs
index be924d78..367a7b00 100644
--- a/Source/OpenTK/Math/Matrix4d.cs
+++ b/Source/OpenTK/Math/Matrix4d.cs
@@ -229,7 +229,7 @@ namespace OpenTK
         public double M41 { get { return Row3.X; } set { Row3.X = value; } }
 
         /// <summary>
-        /// Gets or sets the value at row 4, column 3 of this instance.
+        /// Gets or sets the value at row 4, column 2 of this instance.
         /// </summary>
         public double M42 { get { return Row3.Y; } set { Row3.Y = value; } }