diff --git a/data_structures/linked_list/doubly_linked_list.py b/data_structures/linked_list/doubly_linked_list.py
index e449ed6ec8ac..6d38cdeab202 100644
--- a/data_structures/linked_list/doubly_linked_list.py
+++ b/data_structures/linked_list/doubly_linked_list.py
@@ -10,6 +10,19 @@
 
 
 class LinkedList:  # making main class named linked list
+    """
+    >>> linked_list = LinkedList()
+    >>> linked_list.insertHead("a")
+    >>> linked_list.insertTail("b")
+    >>> _ = linked_list.deleteTail()
+    >>> linked_list.isEmpty()
+    False
+    >>> linked_list.deleteHead()
+    None
+    >>> linked_list.isEmpty()
+    True
+    """
+
     def __init__(self):
         self.head = None
         self.tail = None