Add comment on TBR'ing GN bootstrap changes.
It should be clear that people can TBR certain types of updates to the
bootstrap script.
Review-Url: https://codereview.chromium.org/2776313004
Cr-Original-Commit-Position: refs/heads/master@{#460444}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: b17ee3d6890cf542ff39366a5f6579d540314829
diff --git a/tools/gn/bootstrap/OWNERS b/tools/gn/bootstrap/OWNERS
index 72e8ffc..21aeec2 100644
--- a/tools/gn/bootstrap/OWNERS
+++ b/tools/gn/bootstrap/OWNERS
@@ -1 +1,4 @@
+# It's OK to TBR changes to bootstrap.py that edits the file lists to bring
+# them in line with the Chrome build. For more substantial changes, please
+# send a normal review.
*
