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diff --git a/src/glm/gtx/normalize_dot.hpp b/src/glm/gtx/normalize_dot.hpp
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+++ b/src/glm/gtx/normalize_dot.hpp
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+//////////////////////////////////////////////////////////////////////////////////
+// OpenGL Mathematics Copyright (c) 2005 - 2011 G-Truc Creation (www.g-truc.net)
+//////////////////////////////////////////////////////////////////////////////////
+// Created : 2007-09-28
+// Updated : 2008-10-07
+// Licence : This source is under MIT License
+// File    : glm/gtx/normalize_dot.hpp
+//////////////////////////////////////////////////////////////////////////////////
+// Dependency:
+// - GLM core
+// - GLM_GTX_fast_square_root
+//////////////////////////////////////////////////////////////////////////////////
+
+#ifndef glm_gtx_normalize_dot
+#define glm_gtx_normalize_dot
+
+// Dependency:
+#include "../glm.hpp"
+#include "../gtx/fast_square_root.hpp"
+
+#if(defined(GLM_MESSAGES) && !defined(glm_ext))
+#	pragma message("GLM: GLM_GTX_normalize_dot extension included")
+#endif
+
+namespace glm{
+namespace gtx{
+namespace normalize_dot	///< GLM_GTX_normalize_dot extension: Dot product of vectors that need to be normalize with a single square root.
+{
+	using namespace gtx::fast_square_root;
+
+	/// \addtogroup gtx_normalize_dot
+	/// @{
+
+	//! Normalize parameters and returns the dot product of x and y.
+	//! It's faster that dot(normalize(x), normalize(y)).
+	//! From GLM_GTX_normalize_dot extension.
+	template <typename genType> 
+	typename genType::value_type normalizeDot(
+		genType const & x, 
+		genType const & y);
+
+	//! Normalize parameters and returns the dot product of x and y.
+	//! Faster that dot(fastNormalize(x), fastNormalize(y)).
+	//! From GLM_GTX_normalize_dot extension.
+	template <typename genType> 
+	typename genType::value_type fastNormalizeDot(
+		genType const & x, 
+		genType const & y);
+
+	/// @}
+}//namespace normalize_dot
+}//namespace gtx
+}//namespace glm
+
+#include "normalize_dot.inl"
+
+namespace glm{using namespace gtx::normalize_dot;}
+
+#endif//glm_gtx_normalize_dot