diff --git a/mo_gymnasium/envs/mujoco/walker2d_v5.py b/mo_gymnasium/envs/mujoco/walker2d_v5.py
index a3446b6..36abe43 100644
--- a/mo_gymnasium/envs/mujoco/walker2d_v5.py
+++ b/mo_gymnasium/envs/mujoco/walker2d_v5.py
@@ -21,7 +21,7 @@ class MOWalker2dEnv(Walker2dEnv, EzPickle):
     - 0: Reward for running forward (x-velocity)
     - 1: Control cost of the action
 
-    # Version History
+    ## Version History
     - See https://gymnasium.farama.org/main/environments/mujoco/walker2d/#version-history
     """