diff --git a/rb_ws/src/buggy/buggy/simulator/velocity_ui.py b/rb_ws/src/buggy/buggy/simulator/velocity_ui.py
index 3070439..4bc845e 100644
--- a/rb_ws/src/buggy/buggy/simulator/velocity_ui.py
+++ b/rb_ws/src/buggy/buggy/simulator/velocity_ui.py
@@ -30,7 +30,7 @@ def __init__(self, init_vel: float, buggy_name: str):
 
         # ROS2 timer for stepping
         # 0.01 is equivalent to 100Hz (100 times per second)
-        self.create_timer(0.01, self.step)  
+        self.create_timer(0.01, self.step)
 
     def step(self):
         # Sets the velocity of the buggy to the current scale value
diff --git a/rb_ws/src/buggy/buggy/simulator/velocity_updater.py b/rb_ws/src/buggy/buggy/simulator/velocity_updater.py
index 4bc628b..6cc90f3 100644
--- a/rb_ws/src/buggy/buggy/simulator/velocity_updater.py
+++ b/rb_ws/src/buggy/buggy/simulator/velocity_updater.py
@@ -1,17 +1,18 @@
 #! /usr/bin/env python3
 import sys
 import math
+import threading
 import rclpy
 from rclpy.node import Node
 from controller_2d import Controller
 from geometry_msgs.msg import Pose
 from geometry_msgs.msg import Point
-import threading
 
 class VelocityUpdater(Node):
     RATE = 100
     # Bubbles for updating acceleration based on position
     # represented as 4-tuples: (x-pos, y-pos, radius, acceleration)
+    # 'list[tuple[float,float,float,float]]'
     # need further update such as more data or import data from certain files
     CHECKPOINTS = [
         (589701, 4477160, 20, 0.5)