Add mkinitrd
diff --git a/src/Makefile b/src/Makefile
index fc7b8e3..11ea55c 100644
--- a/src/Makefile
+++ b/src/Makefile
@@ -5,3 +5,5 @@
 
 mkinitrd:
 	$(MAKE) -C mkinitrd
+
+.PHONY: kernel mkinitrd