diff --git a/README.md b/README.md
--- a/README.md
+++ b/README.md
@@ -271,6 +271,8 @@
 
 > **_NOTE_**: It works for basic changes on the swh-site and data configurations. For other changes like declaring a new puppet module, the ``prepare-vagrant-conf`` must be called to completely rebuild the configuration.
 
+> **_NOTE_**: The ``watch-vagrant-conf`` script uses inotify and especially the ``inotifywait`` command to detect the changes. The package ``inotify-tools`` needs to be installed on the local environment.
+
 #### connect to a vm
 
 A shell can be opened to a running vm with this command: