diff --git a/Makefile b/Makefile
index df3f521..cb3342f 100644
--- a/Makefile
+++ b/Makefile
@@ -3,7 +3,7 @@ HOS = hos
 MKISOFS = genisoimage
 ISO = $(HOS).iso
 
-.PHONY: kernel iso
+.PHONY: kernel iso clean
 
 # default target: build the kernel and ISO image
 all: kernel iso
@@ -16,3 +16,7 @@ kernel:
 iso: kernel
 	$(MKISOFS) -R -b boot/grub/stage2_eltorito -no-emul-boot \
 		-boot-load-size 4 -boot-info-table -o $(ISO) iso
+
+clean:
+	make -C kernel clean
+	-rm -f $(ISO)
diff --git a/kernel/Makefile b/kernel/Makefile
index 53ff566..ebbed51 100644
--- a/kernel/Makefile
+++ b/kernel/Makefile
@@ -1,3 +1,8 @@
 
+.PHONY: clean
+
 all:
 	@echo Nothing yet
+
+clean:
+	@echo Nothing yet