Fix CartPole being made instead of Pendulum
diff --git a/gym/envs/classic_control/pendulum.py b/gym/envs/classic_control/pendulum.py
index 1c65ddbd98a..d979b242084 100644
--- a/gym/envs/classic_control/pendulum.py
+++ b/gym/envs/classic_control/pendulum.py
@@ -64,7 +64,7 @@ class PendulumEnv(gym.Env):
     `g=10.0`.
 
     ```
-    gym.make('CartPole-v1', g=9.81)
+    gym.make('Pendulum-v1', g=9.81)
     ```
 
     ## Version History
