diff --git a/cachematrix.R b/cachematrix.R
index a50be65aa44..264d236b9b1 100644
--- a/cachematrix.R
+++ b/cachematrix.R
@@ -1,15 +1,37 @@
-## Put comments here that give an overall description of what your
-## functions do
+## overall discription: this couple of functions required to caches an inverse of matrix. 
 
-## Write a short comment describing this function
 
-makeCacheMatrix <- function(x = matrix()) {
+## 1 this function builds 4 functions and returns them within a list to the parent environment. 
 
+makeCacheMatrix <- function(x = matrix()) {
+  m <- NULL
+  set <- function(y) {
+    x <<- y
+    m <<- NULL
+  }
+  get <- function() x
+  setinverse <- function(solve) m <<- solve
+  getinverse <- function() m
+  list(set = set, get = get,
+       setinverse = setinverse,
+       getinverse = getinverse)
 }
 
 
-## Write a short comment describing this function
+## 2 this function retrieves matrix inverse from makeCacheMatrix or calculates the inverse and return it. 
+#it checks if m is NULL.
+#If m is NULL than function calculates matrix inverse
+#if m isn't NULL than function retrieves the value from makeCacheMatrix
 
 cacheSolve <- function(x, ...) {
         ## Return a matrix that is the inverse of 'x'
+  m <- x$getinverse()
+  if(!is.null(m)) {
+    message("getting cached data")
+    return(m)
+  }
+  data <- x$get()
+  m <- solve(data, ...)
+  x$setinverse(m) 
+  m
 }