Update pendulum.py
diff --git a/gym/envs/classic_control/pendulum.py b/gym/envs/classic_control/pendulum.py
index 2a1f11a65bd..3a1c6edac34 100644
--- a/gym/envs/classic_control/pendulum.py
+++ b/gym/envs/classic_control/pendulum.py
@@ -49,7 +49,7 @@ class PendulumEnv(gym.Env):
     | Num | Observation      | Min  | Max |
     |-----|------------------|------|-----|
     | 0   | x = cos(theta)   | -1.0 | 1.0 |
-    | 1   | y = sin(angle)   | -1.0 | 1.0 |
+    | 1   | y = sin(theta)   | -1.0 | 1.0 |
     | 2   | Angular Velocity | -8.0 | 8.0 |
 
     ### Rewards

Minor: more consistent docstring