diff --git a/ExistingProjects/Tryton/Installation.mdwn b/ExistingProjects/Tryton/Installation.mdwn
index fbe63c6795019a5efabb4949e8f61b081e51236f..62d118368c1e9bd08b7e99576464dff371c2fbaf 100644
--- a/ExistingProjects/Tryton/Installation.mdwn
+++ b/ExistingProjects/Tryton/Installation.mdwn
@@ -5,5 +5,5 @@
 ## Tryton installation
 
 1. `sudo apt-get update`
-2. `sudo apt-get install python-pip python-dev`
+2. `sudo apt-get install python-pip python-dev libxml2-dev libxslt1-dev`
 3. `sudo pip install tryton trytond`