Add OS-support notice to README

diff --git a/README b/README
index 38ec27a4adc1d6aed47f1ace63c1b4cc2ce6f9ed..d55f23b91090639e04a6dee1105c67206dae010b 100644 (file)
--- a/README
+++ b/README
@@ -32,6 +32,7 @@ Features
 
 Requirements
 ------------
+Currently slstatus works on FreeBSD, Linux and OpenBSD.
 In order to build slstatus you need the Xlib header files.