diff --git a/kernel/console.h b/kernel/console.h
index 3dd07e8..d7268f2 100644
--- a/kernel/console.h
+++ b/kernel/console.h
@@ -23,6 +23,12 @@ extern struct console console_root;
 
 struct console * console_create_root();
 
+/*
+  Switch to serial consol #portnr ?
+  If not, -1
+*/
+extern int console_serial;
+
 /*
 Any number of other consoles can be created and manipulated
 on top of existing windows.