diff --git a/sweet_math.h b/sweet_math.h
index 8e46ec5..2ee18b8 100644
--- a/sweet_math.h
+++ b/sweet_math.h
@@ -31,11 +31,12 @@
  *
 **/
 
-/** This macro define the PI number with a relative great precision */
+/** This macro define well known numbers with a relative great precision */
 #define SWEET_PI_OVER_3 1.047197551196597746154214
 #define SWEET_PI_OVER_2 1.570796326794896619231321
 #define SWEET_PI        3.141592653589793238462643
 #define SWEET_2PI       6.283185307179586476925286
+#define SWEET_GOLDEN_RATIO 1.618033988749894848204586
 
 /** RadianToDegree */
 /** @param Radian as float or double */