diff --git a/cloud/training/101.md b/cloud/training/101.md
index f934e3f..30bcbc3 100644
--- a/cloud/training/101.md
+++ b/cloud/training/101.md
@@ -22,12 +22,18 @@
 The goal of this workshop is to manipulate and manage OpenStack API from CLI.
 
 ## Install `openstack` cli
-First, install `openstack` cli from pip:
+First, install `openstack` cli from pip, inside a virtual env
 ```
-apt-get install python3-pip libffi-dev python3-venv
+# Create the virtual env
 python3 -m venv /opt/oscli
+
+# Enable the virtual env
 source /opt/oscli/bin/activate
+
+# Upgrade pip
 pip install --upgrade pip
+
+# Install openstack client
 pip install python-openstackclient
 ```
 
diff --git a/userdata/isen-postinstall.sh b/userdata/isen-postinstall.sh
index 9dead03..6af57c0 100644
--- a/userdata/isen-postinstall.sh
+++ b/userdata/isen-postinstall.sh
@@ -44,8 +44,8 @@ apt-get install -y \
     software-properties-common \
     git \
     sshpass \
-    tmux
-#    nginx \
+    tmux \
+    python3-pip libffi-dev python3-venv
 
 title.print "Configuring tmux and plik"
 wget https://www.arnaudmorin.fr/tmux.conf -O /root/.tmux.conf