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diff --git a/glm/gtx/matrix_query.hpp b/glm/gtx/matrix_query.hpp
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+/// @ref gtx_matrix_query
+/// @file glm/gtx/matrix_query.hpp
+///
+/// @see core (dependence)
+/// @see gtx_vector_query (dependence)
+///
+/// @defgroup gtx_matrix_query GLM_GTX_matrix_query
+/// @ingroup gtx
+///
+/// Include <glm/gtx/matrix_query.hpp> to use the features of this extension.
+///
+/// Query to evaluate matrix properties
+
+#pragma once
+
+// Dependency:
+#include "../glm.hpp"
+#include "../gtx/vector_query.hpp"
+#include <limits>
+
+#if GLM_MESSAGES == GLM_ENABLE && !defined(GLM_EXT_INCLUDED)
+#	ifndef GLM_ENABLE_EXPERIMENTAL
+#		pragma message("GLM: GLM_GTX_matrix_query is an experimental extension and may change in the future. Use #define GLM_ENABLE_EXPERIMENTAL before including it, if you really want to use it.")
+#	else
+#		pragma message("GLM: GLM_GTX_matrix_query extension included")
+#	endif
+#endif
+
+namespace glm
+{
+	/// @addtogroup gtx_matrix_query
+	/// @{
+
+	/// Return whether a matrix a null matrix.
+	/// From GLM_GTX_matrix_query extension.
+	template<typename T, qualifier Q>
+	GLM_FUNC_DECL bool isNull(mat<2, 2, T, Q> const& m, T const& epsilon);
+
+	/// Return whether a matrix a null matrix.
+	/// From GLM_GTX_matrix_query extension.
+	template<typename T, qualifier Q>
+	GLM_FUNC_DECL bool isNull(mat<3, 3, T, Q> const& m, T const& epsilon);
+
+	/// Return whether a matrix is a null matrix.
+	/// From GLM_GTX_matrix_query extension.
+	template<typename T, qualifier Q>
+	GLM_FUNC_DECL bool isNull(mat<4, 4, T, Q> const& m, T const& epsilon);
+
+	/// Return whether a matrix is an identity matrix.
+	/// From GLM_GTX_matrix_query extension.
+	template<length_t C, length_t R, typename T, qualifier Q, template<length_t, length_t, typename, qualifier> class matType>
+	GLM_FUNC_DECL bool isIdentity(matType<C, R, T, Q> const& m, T const& epsilon);
+
+	/// Return whether a matrix is a normalized matrix.
+	/// From GLM_GTX_matrix_query extension.
+	template<typename T, qualifier Q>
+	GLM_FUNC_DECL bool isNormalized(mat<2, 2, T, Q> const& m, T const& epsilon);
+
+	/// Return whether a matrix is a normalized matrix.
+	/// From GLM_GTX_matrix_query extension.
+	template<typename T, qualifier Q>
+	GLM_FUNC_DECL bool isNormalized(mat<3, 3, T, Q> const& m, T const& epsilon);
+
+	/// Return whether a matrix is a normalized matrix.
+	/// From GLM_GTX_matrix_query extension.
+	template<typename T, qualifier Q>
+	GLM_FUNC_DECL bool isNormalized(mat<4, 4, T, Q> const& m, T const& epsilon);
+
+	/// Return whether a matrix is an orthonormalized matrix.
+	/// From GLM_GTX_matrix_query extension.
+	template<length_t C, length_t R, typename T, qualifier Q, template<length_t, length_t, typename, qualifier> class matType>
+	GLM_FUNC_DECL bool isOrthogonal(matType<C, R, T, Q> const& m, T const& epsilon);
+
+	/// @}
+}//namespace glm
+
+#include "matrix_query.inl"