diff --git a/P3- Writing comments in Python.md b/P3- Writing comments in Python.md
index a17e9ac..b888e12 100644
--- a/P3- Writing comments in Python.md	
+++ b/P3- Writing comments in Python.md	
@@ -39,3 +39,5 @@ print(str(x))  # printing 'x' as a string rather than an integer
 2) Adding explanatory note of a source code
 3) Comment a part of the code during testing
 4) Adding a plan regarding the design of a source code
+5) Other programmer or user get help to understand the code
+6) Able to comment exact function of the code.
diff --git a/P4- Variables and Data Types.md b/P4- Variables and Data Types.md
index 0d965c2..162a8d1 100644
--- a/P4- Variables and Data Types.md	
+++ b/P4- Variables and Data Types.md	
@@ -13,6 +13,8 @@ Suppose, we wanted to change the name and age of the person. We would have to go
 ```python
 variable_name = data
 ```
+Basically veriable is container where we can store diffrernt types of data . 
+That data can be integer, float, string, character... etc
 Now, the type of data we store in a variable specifies the data type of a variable. A data type of a variable is the type of data stored by a variable. Some most used data types are-
 
 1) String(str) - A string of characters
diff --git a/README.md b/README.md
index 04d8064..d109a4b 100644
--- a/README.md
+++ b/README.md
@@ -17,3 +17,4 @@ This lesson explains the concepts of commenting, single-line and multi-line comm
 This lesson covers the concepts of variables and data types. It also discusses about basic concepts of strings and problems faced by a newbie.
 
 ## Lesson 5
+This lesson is  about strings in python . It contain basic examples. Accessing element , accessing words in string or indexing in strings and reversing string