diff --git a/src/OpenTK/Math/Vector3.cs b/src/OpenTK/Math/Vector3.cs
index b37a7184..6e2d1c11 100644
--- a/src/OpenTK/Math/Vector3.cs
+++ b/src/OpenTK/Math/Vector3.cs
@@ -237,7 +237,7 @@ namespace OpenTK
         public static readonly Vector3 UnitY = new Vector3(0, 1, 0);
 
         /// <summary>
-        /// /// Defines a unit-length Vector3 that points towards the Z-axis.
+        /// Defines a unit-length Vector3 that points towards the Z-axis.
         /// </summary>
         public static readonly Vector3 UnitZ = new Vector3(0, 0, 1);
 
diff --git a/src/OpenTK/Math/Vector3d.cs b/src/OpenTK/Math/Vector3d.cs
index a2d4109e..9100f9cd 100644
--- a/src/OpenTK/Math/Vector3d.cs
+++ b/src/OpenTK/Math/Vector3d.cs
@@ -235,7 +235,7 @@ namespace OpenTK
         public static readonly Vector3d UnitY = new Vector3d(0, 1, 0);
 
         /// <summary>
-        /// /// Defines a unit-length Vector3d that points towards the Z-axis.
+        /// Defines a unit-length Vector3d that points towards the Z-axis.
         /// </summary>
         public static readonly Vector3d UnitZ = new Vector3d(0, 0, 1);