diff --git a/ciw/exit_node.py b/ciw/exit_node.py
index 05b0b46..fd1ed6e 100644
--- a/ciw/exit_node.py
+++ b/ciw/exit_node.py
@@ -1,12 +1,8 @@
-class ExitNode(object):
-    """
-    Class for the exit node on our network.
-    """
+class ExitNode:
+    """Exit node on our network."""
 
     def __init__(self):
-        """
-        Initialise the exit node.
-        """
+        """Initialise the exit node."""
         self.all_individuals = []
         self.number_of_individuals = 0
         self.number_of_completed_individuals = 0