kbuild: add comment for V=2 mode
Complete the comments for valid values of KBUILD_VERBOSE,
specifically for KBUILD_VERBOSE=2.
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
diff --git a/Makefile b/Makefile
index 0914049..2afa692 100644
--- a/Makefile
+++ b/Makefile
@@ -68,6 +68,7 @@
#
# If KBUILD_VERBOSE equals 0 then the above command will be hidden.
# If KBUILD_VERBOSE equals 1 then the above command is displayed.
+# If KBUILD_VERBOSE equals 2 then give the reason why each target is rebuilt.
#
# To put more focus on warnings, be less verbose as default
# Use 'make V=1' to see the full commands