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-rw-r--r--contrib/devtools/README.md2
1 files changed, 2 insertions, 0 deletions
diff --git a/contrib/devtools/README.md b/contrib/devtools/README.md
index d66eff66be..0c8c396503 100644
--- a/contrib/devtools/README.md
+++ b/contrib/devtools/README.md
@@ -7,6 +7,8 @@ clang-format-diff.py
A script to format unified git diffs according to [.clang-format](../../src/.clang-format).
+Requires `clang-format`, installed e.g. via `brew install clang-format` on macOS.
+
For instance, to format the last commit with 0 lines of context,
the script should be called from the git root folder as follows.