diff --git a/source/_components/device_tracker.fritz.markdown b/source/_components/device_tracker.fritz.markdown
index fa7ae119426..40d7bfa985d 100644
--- a/source/_components/device_tracker.fritz.markdown
+++ b/source/_components/device_tracker.fritz.markdown
@@ -17,7 +17,7 @@ The `fritz` platform offers presence detection by looking at connected devices t
 
 <p class='note warning'>
 It might be necessary to install additional packages: <code>$ sudo apt-get install libxslt-dev libxml2-dev python3-lxml</code>
-</p>
+If you are working with the All-in-One installation, you may also need to execute also within your virtual environment the command <code> pip install lxml</code>; be patient this will take a while.</p>
 
 To use an Fritz!Box router in your installation, add the following to your `configuration.yaml` file: