fix out-of-source-tree build

diff --git a/Makefile b/Makefile
index f6991ac..e97330a 100644
--- a/Makefile
+++ b/Makefile
@@ -760,7 +760,7 @@
 # 2) Create the include2 directory, used for the second asm symlink
 prepare3: .kernelrelease
 ifneq ($(KBUILD_SRC),)
-	@echo '  Using $(srctree) as source for kernel'
+	@echo '  Using $(srctree) as source for busybox'
 	$(Q)if [ -f $(srctree)/.config ]; then \
 		echo "  $(srctree) is not clean, please run 'make mrproper'";\
 		echo "  in the '$(srctree)' directory.";\