diff --git a/Documentation.md b/Documentation.md
new file mode 100644
index 0000000..8151b44
--- /dev/null
+++ b/Documentation.md
@@ -0,0 +1,51 @@
+# **Installation**
+##  **From Terminal**
+####    1. use command `pip3 install easyPythonPi` 
+####      2. import using `From easyPythonpi.easyPythonpi import*`
+
+## **Functions in _easyPythonPi_ Library**
+
+###  **_add(x, y)_**
+
+#### \*For adding two numbers
+
+## **_sub(x, y)_**
+
+#### \* For subtracting two numbers
+
+## **_div(x, y)_**
+
+#### \* For dividing two numbers
+
+#### \* This will return quotient
+
+## **_mod(x, y)_**
+
+#### \* For dividing two numbers
+
+#### \* This will return reminder
+
+## **_factorial(n)_**
+
+#### \* This will give factorial of the number i.e n 
+
+#### \* eg: n = 3
+####        3 x 2 x 1 = 6   
+
+## **_AreaCircle(r)_**
+
+#### \* Will give area of circle
+#### \* Takes radius as parameter
+
+## **_PerimeterCircle(r)_**
+
+#### \* Will give the perimeter of circle
+#### \* Takes radius as parameter
+
+## **_fibonacci(n)_**
+
+#### \* **[Click To Learn About Fibonacci Series In Python]**(https://www.programiz.com/python-programming/examples/fibonacci-sequence#:~:text=A%20Fibonacci%20sequence%20is%20the,n%2D2th%20term.)
+
+## **_sort(list)_**
+
+#### \* For sorting(i.e ascending order) [ bubble sort ]
diff --git a/module.py b/module.py
index 8ec1185..d5bc653 100644
--- a/module.py
+++ b/module.py
@@ -24,11 +24,11 @@ def factorial(n): # To find the factorial of 2 numbers
     # single line to find factorial
     return 1 if (n == 1 or n == 0) else n * factorial(n - 1)
 
-def Area_circle(r):  # To find the area of a circle using the radius r
+def AreaCircle(r):  # To find the area of a circle using the radius r
     PI = 3.142
     return PI * (r * r)
 
-def Perimeter_circle(r): # To find the perimeter of a circle using the radius r
+def PerimeterCircle(r): # To find the perimeter of a circle using the radius r
     PI = 3.142
     return 2 * PI * r