diff --git a/docs/README.md b/docs/README.md
index 8077118ebe..bb97497367 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -1,29 +1,188 @@
-# User Guide
+# DUKE
+Duke is a task management application which allows users to keep track of all their tasks.
 
 ## Features 
 
-### Feature-ABC
+### List tasks
 
-Description of the feature.
+List all the tasks saved in Duke.
 
-### Feature-XYZ
+### Add task
 
-Description of the feature.
+Add a task to Duke, you can add a todo task, a deadline task or a event task.
+
+### Delete task
+
+Delete a task from Duke.
+
+### Mark/Unmark task
+
+Mark a task as completed or unmark it as not completed.
+
+### Find task
+
+Find a task using a keyword.
+
+### Sort task
+
+Sort the tasks by their task type, deadline and event tasks will also be sorted by their time.
 
 ## Usage
 
-### `Keyword` - Describe action
+### `list` - Shows all tasks saved in Duke
+
+Shows a list of tasks that you have added to Duke.
+
+Example of usage: 
+
+`list`
+
+Expected outcome:
+
+Displays a list of tasks with their mark/unmark status as well as the task type.
+
+```
+Here are the tasks in your list:
+1. [D][ ] CS2106 Lab (by: Mar 05 2022 11:59 PM)
+2. [T][ ] watch movie
+3. [D][ ] CS2103 Assignment (by: Mar 01 2022 6:00 PM)
+4. [E][ ] Career Fair (at: Mar 25 2022 9:00 AM)
+```
+### `todo` - Adds a todo task
+
+Adds a todo task to the task list.
+
+Example of usage: 
+
+`todo go to the gym`
+
+Expected outcome:
+
+Displays the confirmation of the todo task added and the number of tasks in the list.
+
+```
+Got it. I've added this task:
+ [T][ ] go to the gym
+Now you have 5 tasks in the list.
+```
+### `deadline` - Adds a deadline task
+
+Adds a deadline task to the task list.
+
+Example of usage: 
+
+`deadline CS2040s Lab /by 2022-03-21 2359`
+
+Expected outcome:
+
+Displays the confirmation of the deadline task added and the number of tasks in the list.
+
+```
+Got it. I've added this task:
+ [D][ ] CS2040s Lab (by: Mar 21 2022 11:59pm)
+Now you have 6 tasks in the list.
+```
+### `event` - Adds a event task
+
+Adds a event task to the task list.
+
+Example of usage: 
+
+`event friends gathering /at 2020-02-23 1800`
+
+Expected outcome:
+
+Displays the confirmation of the event task added and the number of tasks in the list.
+
+```
+Got it. I've added this task:
+ [E][ ] friends gathering (at: Feb 23 2022 6:00pm)
+Now you have 7 tasks in the list.
+```
+### `mark` - mark a task as done
+
+Mark a task as completed in the task list.
+
+Example of usage: 
+
+`mark 3`
+
+Expected outcome:
+
+Displays a confirmation that the task is marked.
+
+```
+Nice!. I've marked this task as done:
+ [D][X] CS2040s Lab (by: Mar 21 2022 11:59pm)
+```
+### `unmark` - unmark a task as not done
+
+Unmark a task as not completed in the task list.
+
+Example of usage: 
+
+`unmark 3`
+
+Expected outcome:
+
+Displays a confirmation that the task is unmarked.
+
+```
+Nice!. I've marked this task as not done yet:
+ [D][] CS2040s Lab (by: Mar 21 2022 11:59pm)
+```
+### `find` - find tasks with a keyword
+
+Find matching tasks in the task list that contains the keyword.
+
+Example of usage: 
+
+`find Lab`
+
+Expected outcome:
+
+Display a list of tasks that contains the keyword.
+
+```
+Here are the matching tasks in your list:
+ 1.[D][] CS2106 Lab (by: Mar 05 2022 11:59pm)
+ 2.[D][] CS2040s Lab (by: Mar 21 2022 11:59pm)
+```
+
+### `sort` - sort the task list
+
+Sort the task list by grouping them according to their task type. The deadline tasks and event tasks will also be sorted by their date and time.
+
+Example of usage: 
+
+`sort`
+
+Expected outcome:
+
+Display the sorted task list.
+
+```
+Here are the matching tasks in your list:
+ 1.[T][] watch movie
+ 2.[T][] go to the gym
+ 3.[D][] CS2103 Assignment (by: Mar 01 2022 6:00pm)
+ 4.[D][] CS2106 Lab (by: Mar 05 2022 11:59pm)
+ 5.[D][] CS2040s Lab (by: Mar 21 2022 11:59pm)
+ 6.[E][] friends gathering (at: Feb 23 2022 6:00pm)
+ 7.[E][] Career Fair (at: Mar 25 2022 9:00am)
+```
+### `bye` - exits the applicantion
 
-Describe the action and its outcome.
+Exits the application.
 
 Example of usage: 
 
-`keyword (optional arguments)`
+`bye`
 
 Expected outcome:
 
-Description of the outcome.
+Display a bye message and the application closes after 3 seconds.
 
 ```
-expected output
+Ciao! Hope to see you again!
 ```