Index: mouse.h
===================================================================
--- mouse.h	(revision 790)
+++ mouse.h	(revision 791)
@@ -8,7 +8,7 @@
 // Introduction
 /**
 Mouse API is almost explainded at the top of this guide, but here it 
-is some other usefull functions (macros, in facts)
+is some other usefull functions (macros, in fact).
 **/
 
 
@@ -55,4 +55,21 @@
 returns ##button## state. (See first part of this document)
 **/
 
+// Mouse Wheel
+/**
+To get the mouse wheel status you have to check directly the variable 
+##raydium_mouse_click##. 
+ -Value 4 means "mouse wheel up". 
+ -Value 5 means "mouse wheel down".
+Usage example:
+%%(c)
+if (raydium_mouse_click==4)
+	zoom*=1.1f;
+if (raydium_mouse_click==5)
+	zoom*=0.9f;
+%%
+This piece of code will change the value of zoom according mouse wheel.
+**/
+
+
 #endif