diff --git a/TARGETS b/TARGETS
index 267b3cea8a..ab1f24cd76 100644
--- a/TARGETS
+++ b/TARGETS
@@ -1,3 +1,8 @@
+# This file @generated by `python buckifier/buckify_rocksdb.py`
+# --> DO NOT EDIT MANUALLY <--
+# This file is a Facebook-specific integration for buck builds, so can
+# only be validated by Facebook employees.
+#
 load("@fbcode_macros//build_defs:auto_headers.bzl", "AutoHeaders")
 load("@fbcode_macros//build_defs:cpp_library.bzl", "cpp_library")
 load(":defs.bzl", "test_binary")
diff --git a/buckifier/targets_cfg.py b/buckifier/targets_cfg.py
index 19ea777270..0ecd6fdda7 100644
--- a/buckifier/targets_cfg.py
+++ b/buckifier/targets_cfg.py
@@ -3,7 +3,13 @@ from __future__ import absolute_import
 from __future__ import division
 from __future__ import print_function
 from __future__ import unicode_literals
-rocksdb_target_header = """load("@fbcode_macros//build_defs:auto_headers.bzl", "AutoHeaders")
+
+rocksdb_target_header = """# This file \100generated by `python buckifier/buckify_rocksdb.py`
+# --> DO NOT EDIT MANUALLY <--
+# This file is a Facebook-specific integration for buck builds, so can
+# only be validated by Facebook employees.
+#
+load("@fbcode_macros//build_defs:auto_headers.bzl", "AutoHeaders")
 load("@fbcode_macros//build_defs:cpp_library.bzl", "cpp_library")
 load(":defs.bzl", "test_binary")
 
diff --git a/defs.bzl b/defs.bzl
index d5b7b6af71..83e9a579f9 100644
--- a/defs.bzl
+++ b/defs.bzl
@@ -1,4 +1,7 @@
 # Copyright (c) Facebook, Inc. and its affiliates. All Rights Reserved.
+#
+# defs.bzl - Definitions for Facebook-specific buck build integration
+# in TARGETS
 
 load("@fbcode_macros//build_defs:cpp_binary.bzl", "cpp_binary")
 load("@fbcode_macros//build_defs:custom_unittest.bzl", "custom_unittest")