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+This directory consumes tools from other repositories for use on the
+bots. To update to newer revisions, follow these instructions:
+
+DEPS: Set all revisions to those used in Chromium, found at
+   https://chromium.googlesource.com/chromium/src/+/master/DEPS (Search for the
+   corresponding repository name.)
+
+go/bootstrap.py: Set TOOLSET_VERSION to the latest release of Go, found at
+    https://golang.org/dl/.
+
+update_clang.py: Set CLANG_REVISION and CLANG_SUB_REVISION to the values used in
+    Chromium, found at
+    https://chromium.googlesource.com/chromium/src/+/master/tools/clang/scripts/update.py
+
+vs_toolchain.py: Set the hash in TOOLCHAIN_HASH to the toolchain
+    used in Chromium, found at _GetDesiredVsToolchainHashes
+    https://chromium.googlesource.com/chromium/src/+/master/build/vs_toolchain.py
+    This may require taking other updates to that file. If updating MSVS
+    version, also update TOOLCHAIN_VERSION accordingly.
+
+The .sha1 files correspond to files downloaded from Google Cloud Storage. To
+update, place the updated files in their intended location and run:
+
+    upload_to_google_storage.py -b chromium-tools FILE
+
+cmake-linux64.tar.gz: Download the latest CMake source tarball, found at
+    https://cmake.org/download/. Build it with:
+
+        ./bootstrap --prefix=$PWD/cmake-linux64 && make && make install
+        tar -czf cmake-linux64.tar.gz cmake-linux64/
+
+cmake-mac.tar.gz: Follow the same instructions as above on a Mac, but replace
+    cmake-linux64 with cmake-mac.
+
+cmake-win32.zip: Update to the latest prebuilt release of CMake, found at
+    https://cmake.org/download/. Use the file labeled "Windows ZIP". The
+    download will be named cmake-VERSION-win32-x86.zip.
+
+perl-win32.zip: Update to the latest 32-bit prebuilt "PortableZip" edition of
+    Strawberry Perl, found at http://strawberryperl.com/releases.html. The
+    download will be named strawberry-perl-VERSION-32bit-portable.zip.
+
+yasm-win32.exe: Update to the appropriate release of Yasm. Use the same version
+    as Chromium, found at
+    https://chromium.googlesource.com/chromium/src/+/master/third_party/yasm/README.chromium
+    Use the release at http://yasm.tortall.net/Download.html labeled
+    "Win32 .exe". The download will be named yasm-VERSION-win32.exe.