diff --git a/README.md b/README.md
index 3b98972..a28a427 100644
--- a/README.md
+++ b/README.md
@@ -4,10 +4,16 @@ Generates templated publications based on [pppadump](https://git.le-club-des-san
 
 __requirements__
 
-* python3 / pip3
+* python3 / pip3 / python3-venv
 
 __installation__
 
+Recusively clone pppindex and pppadump:
+
+	$> git clone --recursive https://git.le-club-des-sans-sujets.org/Le-Club-des-Sans-Sujets/pppindex.git
+
+Then set environment:
+
 	$> . setenv
 
 The program will check your python3 environment and interactively asks some questions (if need is):