diff --git a/README.md b/README.md
index 97c9512..7087452 100644
--- a/README.md
+++ b/README.md
@@ -90,6 +90,8 @@ celery -A dmoj_celery worker
 node websocket/daemon.js
 ```
 
+7. To use subdomain for each organization, go to admin page -> navigation bar -> sites, add domain name (e.g, "localhost:8000"). Then go to add `USE_SUBDOMAIN = True` to local_settings.py.
+
 ## Deploy
 Most of the steps are similar to Django tutorials. Here are two usual steps:
 
diff --git a/dmoj/settings.py b/dmoj/settings.py
index 80f42bc..b445574 100644
--- a/dmoj/settings.py
+++ b/dmoj/settings.py
@@ -469,6 +469,9 @@ MESSAGES_TO_LOAD = 15
 
 ML_OUTPUT_PATH = None
 
+# Use subdomain for organizations
+USE_SUBDOMAIN = False
+
 try:
     with open(os.path.join(os.path.dirname(__file__), "local_settings.py")) as f:
         exec(f.read(), globals())
diff --git a/judge/middleware.py b/judge/middleware.py
index 159860e..931e047 100644
--- a/judge/middleware.py
+++ b/judge/middleware.py
@@ -95,10 +95,13 @@ class SubdomainMiddleware(object):
         self.get_response = get_response
 
     def __call__(self, request):
+        request.organization = None
+        if not settings.USE_SUBDOMAIN:
+            return self.get_response(request)
+
         domain = request.get_host()
         site = get_current_site(request).domain
         subdomain = domain[: len(domain) - len(site)]
-        request.organization = None
         if len(subdomain) > 1:
             subdomain = subdomain[:-1]
             try: