diff --git a/source/_docs/z-wave/controllers.markdown b/source/_docs/z-wave/controllers.markdown
index 35c96c5035c..b82dddb5f69 100644
--- a/source/_docs/z-wave/controllers.markdown
+++ b/source/_docs/z-wave/controllers.markdown
@@ -7,6 +7,12 @@ description: "Extended instructions how to setup Z-Wave."
 
 You need to have a compatible Z-Wave stick or module installed. This needs to be a *static controller*, which most Z-Wave sticks and modules will be. If yours is a *bridge* device then it won't work with [OpenZWave](http://openzwave.com/), which is what provides Home Assistant's Z-Wave capabilities. The following devices have been confirmed to work:
 
+<p class='note'>
+
+There have [been reports](https://www.raspberrypi.org/forums/viewtopic.php?f=28&t=245031#p1502030) of the Aeotec stick not working on the Raspberry Pi 4.
+
+</p>
+
 * Aeotec Z-Stick Series 5
 * Everspring USB stick - Gen 5
 * Sigma Designs UZB stick