diff --git a/linked_lists/detect_cycle.py b/linked_lists/detect_cycle.py
index ebd28ed..8cce3e5 100644
--- a/linked_lists/detect_cycle.py
+++ b/linked_lists/detect_cycle.py
@@ -2,6 +2,12 @@
 # -*- coding: utf-8 -*-
 # author: bt3gl
 
+class tNode:
+
+   def __init__(self, val):
+       self.val = val
+       self.next = None
+
 
 def has_cycle(self, head) -> bool: