diff --git a/docs/internals/contributing/committing-code.txt b/docs/internals/contributing/committing-code.txt
index 2a41fe60cfe9..8bd3fc4c3ae8 100644
--- a/docs/internals/contributing/committing-code.txt
+++ b/docs/internals/contributing/committing-code.txt
@@ -256,13 +256,13 @@ The ``scripts/prepare_commit_msg.py`` Python script can be installed as a
 ``prepare-commit-msg`` git hook. It automatically adds the ``[A.B.x]`` prefix
 to the subject line, appends ``Backport of <sha> from main.`` to the commit
 body, and ensures the subject line ends with a period, even when the
-cherry-pick produces conflicts. To install it, create an executable file
-``.git/hooks/prepare-commit-msg`` containing:
+cherry-pick produces conflicts. Copy the script from the main branch, and
+install it as the hook:
 
 .. code-block:: sh
 
-    #!/bin/sh
-    exec python scripts/prepare_commit_msg.py "$@"
+    cp scripts/prepare_commit_msg.py .git/hooks/prepare-commit-msg
+    chmod +x .git/hooks/prepare-commit-msg
 
 Once installed, a plain ``git cherry-pick <sha>`` on a stable branch is
 sufficient; the hook handles the message formatting in all cases.
diff --git a/scripts/prepare_commit_msg.py b/scripts/prepare_commit_msg.py
index bcb5b5faf77f..65f4ac2ab5e6 100755
--- a/scripts/prepare_commit_msg.py
+++ b/scripts/prepare_commit_msg.py
@@ -11,11 +11,13 @@
 - Adds "Backport of <sha> from main." when cherry-picking.
 
 To install:
-  1. Ensure the folder `.git/hooks` exists.
-  2. Create an executable file `.git/hooks/prepare-commit-msg` with content:
+  1. Check out a trusted branch (main).
+  2. Copy this script into the hooks directory:
 
-#!/bin/sh
-exec python scripts/prepare_commit_msg.py "$@"
+cp scripts/prepare_commit_msg.py .git/hooks/prepare-commit-msg
+chmod +x .git/hooks/prepare-commit-msg
+
+Repeat the installation from main to update the hook.
 
 """