diff --git a/term.go b/term.go
index 1f6a38f..d592708 100644
--- a/term.go
+++ b/term.go
@@ -12,6 +12,8 @@
 // 	        panic(err)
 // 	}
 // 	defer term.Restore(int(os.Stdin.Fd()), oldState)
+//
+// Note that on non-Unix systems os.Stdin.Fd() may not be 0.
 package term
 
 // State contains the state of a terminal.