diff --git a/README.md b/README.md
index 7effa473..cb0ffb9f 100644
--- a/README.md
+++ b/README.md
@@ -4,7 +4,12 @@
 
 GUI tool to map input buttons to e.g. change the macro keys of a mouse or
 any keyboard to something different. It should not be device specific, any
-input device supported by Linux plug and play will likely work.
+input device supported by Linux plug and play that reports keyboard events
+will likely work.
+
+This unfortunately doesn't apply to left/middle/right clicks of mice, or
+the common back/forward thumb buttons, but the keypads of MMO mice seem to
+work. Changing single keys of keyboards also works.
 
 <p align="center">
     <img src="data/screenshot.png"/>