Adding comment about assignment.

Author: rakhmad

cachematrix.R

@@ -1,7 +1,7 @@
-## Put comments here that give an overall description of what your
-## functions do
+## Matrix inversion is usually a costly computation and there may be 
+## some benefit to caching the inverse of a matrix rather than compute 
+## it repeatedly
 
-## Write a short comment describing this function
 
 makeCacheMatrix <- function(x = matrix()) {