diff --git a/README.rst b/README.rst
index ef5e090..ac9a419 100644
--- a/README.rst
+++ b/README.rst
@@ -129,7 +129,7 @@ application server. On debian you can put the following content in
 
      <VirtualHost *:80>
      ServerName docbow.example.com
-     
+
      DocumentRoot /var/www
      ProxyPass /static !
      ProxyPass / http://localhost:8000/
@@ -144,4 +144,8 @@ application server. On debian you can put the following content in
 Now run the gunicorn server (it must run as an user which has access to the
 docbow postgresql database)::
 
-     PYTHONPATH=. gunicorn_django -D ./docbow_project/
+     LANG=C.UTF-8 PYTHONPATH=. gunicorn_django -D ./docbow_project/
+
+You must set a charset to use as file are created with name recevied from user
+agents which can contain any unicode character. The locale "C.UTF-8" works in
+this case.