diff --git a/gymnasium/envs/mujoco/ant_v4.py b/gymnasium/envs/mujoco/ant_v4.py
index 71f713c8e..824f87235 100644
--- a/gymnasium/envs/mujoco/ant_v4.py
+++ b/gymnasium/envs/mujoco/ant_v4.py
@@ -169,7 +169,7 @@ class AntEnv(MujocoEnv, utils.EzPickle):
     | `exclude_current_positions_from_observation`| **bool** | `True`| Whether or not to omit the x- and y-coordinates from observations. Excluding the position can serve as an inductive bias to induce position-agnostic behavior in policies |
 
     ## Version History
-    * v4: All MuJoCo environments now use the MuJoCo bindings in mujoco >= 2.1.3
+    * v4: All MuJoCo environments now use the MuJoCo bindings in mujoco >= 2.1.3, also removed contact forces from the default observation space (new variable `use_contact_forces=True` can restore them)
     * v3: Support for `gymnasium.make` kwargs such as `xml_file`, `ctrl_cost_weight`, `reset_noise_scale`, etc. rgb rendering comes from tracking camera (so agent does not run away from screen)
     * v2: All continuous control environments now use mujoco-py >= 1.50
     * v1: max_time_steps raised to 1000 for robot based tasks. Added reward_threshold to environments.