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+# About
+`//build` contains:
+ * Core GN templates and configuration
+ * Core Python build scripts
+
+Since this directory is DEPS'ed in by some other repositories (webrtc, pdfium,
+v8, etc), it should be kept as self-contained as possible by not referring
+to files outside of it. Some exceptions exist (`//testing`, select
+`//third_party` subdirectories), but new dependencies tend to break these other
+projects, and so should be avoided.
+
+Changes to `//build` should be landed in the Chromium repo. They will then be
+replicated to the stand-alone [build repo](https://chromium.googlesource.com/chromium/src/build)
+by the [gsubtreed tool.](https://chromium.googlesource.com/infra/infra/+/main/infra/services/gsubtreed)
+Note: You can find all directories already  available through gsubtreed in the
+[list of all chromium repos](https://chromium.googlesource.com/).
+
+## Contents
+ * `//build/config` - Common templates via `.gni` files.
+ * `//build/toolchain` - GN toolchain definitions.
+ * `Other .py files` - Some are used by GN/Ninja. Some by gclient hooks, some
+   are just random utilities.
+
+Files referenced by `//.gn`:
+ * `//build/BUILDCONFIG.gn` - Included by all `BUILD.gn` files.
+ * `//build/secondary` - An overlay for `BUILD.gn` files. Enables adding
+   `BUILD.gn` to directories that live in sub-repositories.
+ * `//build_overrides` -
+   Refer to [//build_overrides/README.md](../build_overrides/README.md).
+
+## Docs
+
+* [Writing GN Templates](docs/writing_gn_templates.md)
+* [Debugging Slow Builds](docs/debugging_slow_builds.md)
+* [Mac Hermetic Toolchains](docs/mac_hermetic_toolchain.md)
+* [Android Build Documentation](android/docs/README.md)