diff --git a/README.md b/README.md
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--- a/README.md
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@@ -12,12 +12,17 @@ Despite what the name would have you believe, it is a sensor that detects the an
 
 **Which devices have a lid angle sensor?**
 
-It was introduced with the 2019 16-inch MacBook Pro. If your laptop is newer, you probably have it.
+It was introduced with the 2019 16-inch MacBook Pro. If your laptop is newer, you probably have it. People have reported that it **does not work on M1 devices**, I have not yet figured out a fix.
 
 **My laptop should have it, why doesn't it show up?**
 
 I've only tested this on my M4 MacBook Pro and have hard-coded it to look for a specific sensor. If that doesn't work, try running [this script](https://gist.github.com/samhenrigold/42b5a92d1ee8aaf2b840be34bff28591) and report the output in [an issue](https://github.com/samhenrigold/LidAngleSensor/issues/new/choose).
 
+Known problematic models:
+
+- M1 MacBook Air
+- M1 MacBook Pro
+
 **Can I use this on my iMac?**
 
 Not yet tested. Feel free to slam your computer into your desk and make a PR with your results.