 package org.flintparticles.common.easing
 {
 	/**
-	 * A set of easing equations for modifying the particle energy such that it starts
-	 * and ends at zero and peaks at one half way through the particle's lifetime.
+	 * A set of easing equations that start and end at the end value and reach the start value 
+	 * at the half-time point. They are designed for modifying the particle energy such that it 
+	 * starts and ends at zero and peaks at half way through the particle's lifetime.
 	 * 
 	 * @see org.flintparticles.common.actions.Age
 	 */

		public static function quadratic( t : Number, b : Number, c : Number, d : Number ):Number
		{
			t = 1 - (2 * t / d);
			return ( 1 - t * t ) * c + b;
		}
		
		/**

		public static function quartic( t : Number, b : Number, c : Number, d : Number ):Number
		{
			t = 1 - (2 * t / d);
			return t * t * t * t * c + b;
		}
		
		/**
