diff --git a/docs/source/settings.rst b/docs/source/settings.rst
index 75b34da7..c4c6aced 100644
--- a/docs/source/settings.rst
+++ b/docs/source/settings.rst
@@ -471,30 +471,31 @@ access_log_format
 
 The access log format.
 
-==========  ===========
-Identifier  Description
-==========  ===========
-h           remote address
-l           ``'-'``
-u           user name
-t           date of the request
-r           status line (e.g. ``GET / HTTP/1.1``)
-m           request method
-U           URL path without query string
-q           query string
-H           protocol
-s           status
-B           response length
-b           response length or ``'-'`` (CLF format)
-f           referer
-a           user agent
-T           request time in seconds
-D           request time in microseconds
-L           request time in decimal seconds
-p           process ID
-{Header}i   request header
-{Header}o   response header
-==========  ===========
+===========  ===========
+Identifier   Description
+===========  ===========
+h            remote address
+l            ``'-'``
+u            user name
+t            date of the request
+r            status line (e.g. ``GET / HTTP/1.1``)
+m            request method
+U            URL path without query string
+q            query string
+H            protocol
+s            status
+B            response length
+b            response length or ``'-'`` (CLF format)
+f            referer
+a            user agent
+T            request time in seconds
+D            request time in microseconds
+L            request time in decimal seconds
+p            process ID
+{Header}i    request header
+{Header}o    response header
+{Variable}e  environment variable
+===========  ===========
 
 errorlog
 ~~~~~~~~
diff --git a/gunicorn/glogging.py b/gunicorn/glogging.py
index c33eeb25..7dae434e 100644
--- a/gunicorn/glogging.py
+++ b/gunicorn/glogging.py
@@ -303,6 +303,10 @@ class Logger(object):
         # add response headers
         atoms.update(dict([("{%s}o" % k.lower(), v) for k, v in resp_headers]))
 
+        # add environ variables
+        environ_variables = environ.items()
+        atoms.update(dict([("{%s}e" % k.lower(), v) for k, v in environ_variables]))
+
         return atoms
 
     def access(self, resp, req, environ, request_time):