diff --git a/dev/tools/codespell/addCodespellIgnores.sh b/dev/tools/codespell/addCodespellIgnores.sh
index 476c5ba287e..0b73c4c16b2 100755
--- a/dev/tools/codespell/addCodespellIgnores.sh
+++ b/dev/tools/codespell/addCodespellIgnores.sh
@@ -11,10 +11,22 @@
 #   ```shell
 #   echo > dev/tools/codespell/codespell-lines-ignore.txt
 #   ```
-# and then execute this script
+# and then execute this script.
 #
 # author: https://github.com/mdeweerd
 
+#
+# :warning:
+#
+# This script only works properly if codespell is install for your CLI.
+# As the configuration is in pyproject.toml, you also need tomli.
+#
+# ```shell
+# python -m pip install codespell tomli
+# # or
+# pip install codespell tomli
+# ```
+
 codespell_ignore_file=dev/tools/codespell/codespell-lines-ignore.txt
 if [ -z "${0##*.sh}" ] ; then
 	# Suppose running from inside script