diff --git a/prepare-local/README.md b/prepare-local/README.md
index 010b2462..dd8d7c54 100644
--- a/prepare-local/README.md
+++ b/prepare-local/README.md
@@ -18,7 +18,7 @@ Virtualbox, Vagrant and Ansible
 - Ansible:
   - install Ansible's prerequisites:
 
-          $ sudo pip install paramiko PyYAML Jinja2 httplib2 six
+          $ sudo pip install paramiko PyYAML Jinja2 httplib2 six pycrypto
 
   - clone the Ansible repository and checkout to a stable version
     (don't forget the `--recursive` argument when cloning!):