diff --git a/doc/installation.rst b/doc/installation.rst
index bb65e5a3d..395f7e1a2 100644
--- a/doc/installation.rst
+++ b/doc/installation.rst
@@ -25,6 +25,14 @@ To use it, just run the following commands in your terminal:
   > git clone https://github.com/modoboa/modoboa-installer
   > cd modoboa-installer
   > sudo ./run.py <your domain>
+  
+  
+if you get this warning - '/usr/bin/env: ‘python’: No such file or directory', do make sure sure python is installed on your server. Sometimes python is installed but the installer can't detect it or which python version to run, especially on a debian based system. Then run this command first.
+
+.. sourcecode:: bash
+
+   > sudo apt-get install python-virtualenv python-pip
+
 
 Wait a few minutes and you're done \o/