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diff --git a/glm/ext/scalar_ulp.hpp b/glm/ext/scalar_ulp.hpp
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+/// @ref ext_scalar_ulp
+/// @file glm/ext/scalar_ulp.hpp
+///
+/// @defgroup ext_scalar_ulp GLM_EXT_scalar_ulp
+/// @ingroup ext
+///
+/// Allow the measurement of the accuracy of a function against a reference
+/// implementation. This extension works on floating-point data and provide results
+/// in ULP.
+///
+/// Include <glm/ext/scalar_ulp.hpp> to use the features of this extension.
+///
+/// @see ext_vector_ulp
+/// @see ext_scalar_relational
+
+#pragma once
+
+// Dependencies
+#include "../ext/scalar_int_sized.hpp"
+#include "../common.hpp"
+#include "../detail/qualifier.hpp"
+
+#if GLM_MESSAGES == GLM_ENABLE && !defined(GLM_EXT_INCLUDED)
+#	pragma message("GLM: GLM_EXT_scalar_ulp extension included")
+#endif
+
+namespace glm
+{
+	/// Return the next ULP value(s) after the input value(s).
+	///
+	/// @tparam genType A floating-point scalar type.
+	///
+	/// @see ext_scalar_ulp
+	template<typename genType>
+	GLM_FUNC_DECL genType nextFloat(genType x);
+
+	/// Return the previous ULP value(s) before the input value(s).
+	///
+	/// @tparam genType A floating-point scalar type.
+	///
+	/// @see ext_scalar_ulp
+	template<typename genType>
+	GLM_FUNC_DECL genType prevFloat(genType x);
+
+	/// Return the value(s) ULP distance after the input value(s).
+	///
+	/// @tparam genType A floating-point scalar type.
+	///
+	/// @see ext_scalar_ulp
+	template<typename genType>
+	GLM_FUNC_DECL genType nextFloat(genType x, int ULPs);
+
+	/// Return the value(s) ULP distance before the input value(s).
+	///
+	/// @tparam genType A floating-point scalar type.
+	///
+	/// @see ext_scalar_ulp
+	template<typename genType>
+	GLM_FUNC_DECL genType prevFloat(genType x, int ULPs);
+
+	/// Return the distance in the number of ULP between 2 single-precision floating-point scalars.
+	///
+	/// @see ext_scalar_ulp
+	GLM_FUNC_DECL int floatDistance(float x, float y);
+
+	/// Return the distance in the number of ULP between 2 double-precision floating-point scalars.
+	///
+	/// @see ext_scalar_ulp
+	GLM_FUNC_DECL int64 floatDistance(double x, double y);
+
+	/// @}
+}//namespace glm
+
+#include "scalar_ulp.inl"