Added info about regenerating files to Makefile and BUILD templates
diff --git a/templates/Makefile.template b/templates/Makefile.template
index 8513963..ebe207f 100644
--- a/templates/Makefile.template
+++ b/templates/Makefile.template
@@ -2,6 +2,8 @@
# This currently builds C and C++ code.
# This file has been automatically generated from a template file.
# Please look at the templates directory instead.
+# This file can be regenerated from the template by running
+# tools/buildgen/generate_projects.sh
# Copyright 2015, Google Inc.
# All rights reserved.