diff --git a/arch/um/drivers/stdio_console.c b/arch/um/drivers/stdio_console.c
index 5e44adb..e4bfcfe 100644
--- a/arch/um/drivers/stdio_console.c
+++ b/arch/um/drivers/stdio_console.c
@@ -108,6 +108,7 @@
 	return line_open(vts, tty);
 }
 
+/* Set in an initcall, checked in an exitcall */
 static int con_init_done = 0;
 
 static const struct tty_operations console_ops = {