diff --git a/baselines/common/vec_env/vec_env.py b/baselines/common/vec_env/vec_env.py
index 7aa7878..fc6098e 100644
--- a/baselines/common/vec_env/vec_env.py
+++ b/baselines/common/vec_env/vec_env.py
@@ -145,8 +145,7 @@ class VecEnvWrapper(VecEnv):
 
     def __init__(self, venv, observation_space=None, action_space=None):
         self.venv = venv
-        VecEnv.__init__(self,
-                        num_envs=venv.num_envs,
+        super().__init__(num_envs=venv.num_envs,
                         observation_space=observation_space or venv.observation_space,
                         action_space=action_space or venv.action_space)
 
@@ -170,6 +169,11 @@ class VecEnvWrapper(VecEnv):
     def get_images(self):
         return self.venv.get_images()
 
+    def __getattr__(self, name):
+        if name.startswith('_'):
+            raise AttributeError("attempted to get missing private attribute '{}'".format(name))
+        return getattr(self.venv, name)
+
 class VecEnvObservationWrapper(VecEnvWrapper):
     @abstractmethod
     def process(self, obs):
diff --git a/baselines/common/vec_env/vec_monitor.py b/baselines/common/vec_env/vec_monitor.py
index 6e67378..a7b1ce4 100644
--- a/baselines/common/vec_env/vec_monitor.py
+++ b/baselines/common/vec_env/vec_monitor.py
@@ -5,16 +5,18 @@ import time
 from collections import deque
 
 class VecMonitor(VecEnvWrapper):
-    def __init__(self, venv, filename=None, keep_buf=0):
+    def __init__(self, venv, filename=None, keep_buf=0, info_keywords=()):
         VecEnvWrapper.__init__(self, venv)
         self.eprets = None
         self.eplens = None
         self.epcount = 0
         self.tstart = time.time()
         if filename:
-            self.results_writer = ResultsWriter(filename, header={'t_start': self.tstart})
+            self.results_writer = ResultsWriter(filename, header={'t_start': self.tstart},
+                extra_keys=info_keywords)
         else:
             self.results_writer = None
+        self.info_keywords = info_keywords
         self.keep_buf = keep_buf
         if self.keep_buf:
             self.epret_buf = deque([], maxlen=keep_buf)
@@ -30,11 +32,16 @@ class VecMonitor(VecEnvWrapper):
         obs, rews, dones, infos = self.venv.step_wait()
         self.eprets += rews
         self.eplens += 1
-        newinfos = []
-        for (i, (done, ret, eplen, info)) in enumerate(zip(dones, self.eprets, self.eplens, infos)):
-            info = info.copy()
-            if done:
+
+        newinfos = infos[:]
+        for i in range(len(dones)):
+            if dones[i]:
+                info = infos[i].copy()
+                ret = self.eprets[i]
+                eplen = self.eplens[i]
                 epinfo = {'r': ret, 'l': eplen, 't': round(time.time() - self.tstart, 6)}
+                for k in self.info_keywords:
+                    epinfo[k] = info[k]
                 info['episode'] = epinfo
                 if self.keep_buf:
                     self.epret_buf.append(ret)
@@ -44,6 +51,5 @@ class VecMonitor(VecEnvWrapper):
                 self.eplens[i] = 0
                 if self.results_writer:
                     self.results_writer.write_row(epinfo)
-            newinfos.append(info)
-
+                newinfos[i] = info
         return obs, rews, dones, newinfos