build.sh: add documentation for TAGS_CONFIG env. var.
Change-Id: Ib150bf3f9212b533aaecadca4c62d1fedde7ef2b
Signed-off-by: Thierry Strudel <tstrudel@google.com>
diff --git a/build.sh b/build.sh
index 761b6c8..9d96084 100755
--- a/build.sh
+++ b/build.sh
@@ -76,6 +76,10 @@
# POST_KERNEL_BUILD_CMDS
# Command evaluated after `make`.
#
+# TAGS_CONFIG
+# if defined, calls ./scripts/tags.sh utility with TAGS_CONFIG as argument
+# and exit once tags have been generated
+#
# IN_KERNEL_MODULES
# if defined, install kernel modules
#