diff --git a/README.md b/README.md
index 0d5a159..05c871e 100644
--- a/README.md
+++ b/README.md
@@ -53,12 +53,12 @@ source dmojsite/bin/activate
 
 2. Run server:
 ```bash
-python manage.py runserver 0.0.0.0:8000
+python3 manage.py runserver 0.0.0.0:8000
 ```
 
 3. Create a bridge (this is opened in a different terminal with the second step if you are using the same machine)
 ```bash
-python manage.py runbridged
+python3 manage.py runbridged
 ```
 
 4. Create a judge (another terminal)
@@ -83,15 +83,15 @@ node websocket/daemon.js
 Most of the steps are similar to Django tutorials. Here are two usual steps:
 
 1. Update vietnamese translation:
- - If you add any new phrases in the code, ```python manage.py makemessages```
+ - If you add any new phrases in the code, ```python3 manage.py makemessages```
  - go to `locale/vi`
  - modify `.po` file
- - ```python manage.py compilemessages```
- - ```python manage.py compilejsi18n```
+ - ```python3 manage.py compilemessages```
+ - ```python3 manage.py compilejsi18n```
 
 2. Update styles (using SASS)
  - Change .css/.scss files in `resources` folder
- - ```./make_style && python manage.py collectstatic```
+ - ```./make_style.sh && python3 manage.py collectstatic```
  - Sometimes you need to `Ctrl + F5` to see the new user interface in browser.
  
 ## Screenshots
diff --git a/judge/views/problem.py b/judge/views/problem.py
index 4810869..e5e2479 100644
--- a/judge/views/problem.py
+++ b/judge/views/problem.py
@@ -431,11 +431,11 @@ class ProblemPdfDescriptionView(ProblemMixin, SingleObjectMixin, View):
         if not problem.pdf_description:
             raise Http404()
         response = HttpResponse()
-        if request.META.get("SERVER_SOFTWARE", "").startswith("nginx/"):
-            response["X-Accel-Redirect"] = problem.pdf_description.path
-        else:
-            with open(problem.pdf_description.path, "rb") as f:
-                response.content = f.read()
+        #if request.META.get("SERVER_SOFTWARE", "").startswith("nginx/"):
+        #    response["X-Accel-Redirect"] = problem.pdf_description.path
+        #else:
+        with open(problem.pdf_description.path, "rb") as f:
+            response.content = f.read()
 
         response["Content-Type"] = "application/pdf"
         response["Content-Disposition"] = "inline; filename=%s.pdf" % (problem.code,)