Update README: specify python2.7 in virtualenv

Signed-off-by: Keyvan Fatehi <keyvanfatehi@gmail.com>

1 files changed, 1 insertions, 1 deletions

diff --git a/README.rst b/README.rst

index a73c71c77e..afd4bbc4d0 100644
--- a/README.rst
+++ b/README.rst
@@ -808,7 +808,7 @@ directory of your choice::
 Synapse has a number of external dependencies, that are easiest
 to install using pip and a virtualenv::
 
-    virtualenv env
+    virtualenv -p python2.7 env
     source env/bin/activate
     python synapse/python_dependencies.py | xargs pip install
     pip install lxml mock