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diff --git a/doc/glm.pdf b/doc/glm.pdf
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diff --git a/glm/gtc/color_space.hpp b/glm/gtc/color_space.hpp
index 636e5ed8..08ece8f8 100644
--- a/glm/gtc/color_space.hpp
+++ b/glm/gtc/color_space.hpp
@@ -30,19 +30,23 @@ namespace glm
 	/// @addtogroup gtc_color_space
 	/// @{
 
-	/// Convert a linear color to sRGB color using a standard gamma correction
+	/// Convert a linear color to sRGB color using a standard gamma correction.
+	/// IEC 61966-2-1:1999 specification https://www.w3.org/Graphics/Color/srgb
 	template <typename T, precision P, template <typename, precision> class vecType>
 	GLM_FUNC_DECL vecType<T, P> convertLinearToSRGB(vecType<T, P> const & ColorLinear);
 
-	/// Convert a linear color to sRGB color using a custom gamma correction	
+	/// Convert a linear color to sRGB color using a custom gamma correction.
+	/// IEC 61966-2-1:1999 specification https://www.w3.org/Graphics/Color/srgb
 	template <typename T, precision P, template <typename, precision> class vecType>
 	GLM_FUNC_DECL vecType<T, P> convertLinearToSRGB(vecType<T, P> const & ColorLinear, T Gamma);
 
-	/// Convert a sRGB color to linear color using a standard gamma correction
+	/// Convert a sRGB color to linear color using a standard gamma correction.
+	/// IEC 61966-2-1:1999 specification https://www.w3.org/Graphics/Color/srgb
 	template <typename T, precision P, template <typename, precision> class vecType>
 	GLM_FUNC_DECL vecType<T, P> convertSRGBToLinear(vecType<T, P> const & ColorSRGB);
 
-	/// Convert a sRGB color to linear color using a custom gamma correction
+	/// Convert a sRGB color to linear color using a custom gamma correction.
+	// IEC 61966-2-1:1999 specification https://www.w3.org/Graphics/Color/srgb
 	template <typename T, precision P, template <typename, precision> class vecType>
 	GLM_FUNC_DECL vecType<T, P> convertSRGBToLinear(vecType<T, P> const & ColorSRGB, T Gamma);