diff --git a/docs/guide/custom_env.rst b/docs/guide/custom_env.rst
index d769aa5..355ecb2 100644
--- a/docs/guide/custom_env.rst
+++ b/docs/guide/custom_env.rst
@@ -26,29 +26,29 @@ That is to say, your environment must implement the following methods (and inher
   from gym import spaces
 
   class CustomEnv(gym.Env):
-    """Custom Environment that follows gym interface"""
-    metadata = {'render.modes': ['human']}
+      """Custom Environment that follows gym interface"""
+      metadata = {'render.modes': ['human']}
 
-    def __init__(self, arg1, arg2, ...):
-      super(CustomEnv, self).__init__()
-      # Define action and observation space
-      # They must be gym.spaces objects
-      # Example when using discrete actions:
-      self.action_space = spaces.Discrete(N_DISCRETE_ACTIONS)
-      # Example for using image as input (channel-first; channel-last also works):
-      self.observation_space = spaces.Box(low=0, high=255,
-                                          shape=(N_CHANNELS, HEIGHT, WIDTH), dtype=np.uint8)
+      def __init__(self, arg1, arg2, ...):
+          super(CustomEnv, self).__init__()
+          # Define action and observation space
+          # They must be gym.spaces objects
+          # Example when using discrete actions:
+          self.action_space = spaces.Discrete(N_DISCRETE_ACTIONS)
+          # Example for using image as input (channel-first; channel-last also works):
+          self.observation_space = spaces.Box(low=0, high=255,
+                                              shape=(N_CHANNELS, HEIGHT, WIDTH), dtype=np.uint8)
 
-    def step(self, action):
-      ...
-      return observation, reward, done, info
-    def reset(self):
-      ...
-      return observation  # reward, done, info can't be included
-    def render(self, mode='human'):
-      ...
-    def close (self):
-      ...
+      def step(self, action):
+          ...
+          return observation, reward, done, info
+      def reset(self):
+          ...
+          return observation  # reward, done, info can't be included
+      def render(self, mode='human'):
+          ...
+      def close (self):
+          ...
 
 
 Then you can define and train a RL agent with:
diff --git a/docs/misc/changelog.rst b/docs/misc/changelog.rst
index db6b519..5b084ea 100644
--- a/docs/misc/changelog.rst
+++ b/docs/misc/changelog.rst
@@ -39,6 +39,7 @@ Documentation:
 ^^^^^^^^^^^^^^
 - Added doc on Hugging Face integration (@simoninithomas)
 - Added furuta pendulum project to project list (@armandpl)
+- Fix indentation 2 spaces to 4 spaces in custom env documentation example (@Gautam-J)
 
 
 Release 1.4.0 (2022-01-18)
@@ -918,4 +919,4 @@ And all the contributors:
 @benblack769 @bstee615 @c-rizz @skandermoalla @MihaiAnca13 @davidblom603 @ayeright @cyprienc
 @wkirgsn @AechPro @CUN-bjy @batu @IljaAvadiev @timokau @kachayev @cleversonahum
 @eleurent @ac-93 @cove9988 @theDebugger811 @hsuehch @Demetrio92 @thomasgubler @IperGiove @ScheiklP
-@simoninithomas @armandpl @manuel-delverme
+@simoninithomas @armandpl @manuel-delverme @Gautam-J