From d0571d8ac78f536098addac4288e5dce28f93da1 Mon Sep 17 00:00:00 2001
From: Marc Alff <marc.alff@free.fr>
Date: Thu, 17 Nov 2022 02:26:03 +0100
Subject: [PATCH] Fixes #1781 (#1782)

---
 CONTRIBUTING.md | 6 ++++++
 tools/format.sh | 2 +-
 2 files changed, 7 insertions(+), 1 deletion(-)

diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 92815ba556..95b4e226f8 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -87,6 +87,12 @@ git submodule init
 git submodule update
 ```
 
+The source code is automatically formatted using clang-format.
+
+The output can vary between versions, so make sure to install `clang-format`
+version `10.0`, and have `clang-format-10` in your execution path,
+so that the helper script `tools/format.sh` can find it.
+
 Check out a new branch, make modifications and push the branch to your fork:
 
 ```sh
diff --git a/tools/format.sh b/tools/format.sh
index 6f5ae40d56..48714e9a74 100755
--- a/tools/format.sh
+++ b/tools/format.sh
@@ -22,7 +22,7 @@ fi
 # No trailing spaces.
 "${SED[@]}" 's/ \+$//' $($FIND -type f -print)
 
-# If not overridden, try to use clang-format-8 or clang-format.
+# If not overridden, try to use clang-format-10 or clang-format.
 if [[ -z "$CLANG_FORMAT" ]]; then
   CLANG_FORMAT=clang-format
   if which clang-format-10 >/dev/null; then