diff --git a/README.md b/README.md
index a1c386c..e82de8e 100644
--- a/README.md
+++ b/README.md
@@ -114,6 +114,12 @@ Unless specified in the config via `Listen`, it will listen on all network adapt
 * Traffic between link-local unicast IPs and non link-local IPs is not allowed.
 * UPnP is supported on IPv4 only for now.
 
+## OS Support
+
+The code is compatible and tested on Windows, Linux, Mac, and Android.
+
+ARM32 is not supported due to a [Go compiler bug](https://github.com/golang/go/issues/36606) affecting [64-bit atomic access](https://pkg.go.dev/sync/atomic#pkg-note-BUG). This may affect old Raspberry Pis.
+
 ## Contributing
 
 Please note that by contributing code, documentation, ideas, snippets, or any other intellectual property you agree that you have all the necessary rights and you agree that we, the Peernet organization, may use it for any purpose.