diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 9ed22ef..856f56c 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -86,7 +86,8 @@ repos:
     rev: 23.10.0
     hooks:
       - id: black
-        args: ["--line-length", "79", "--target-version", "py310"]
+        #Refer to pyproject.toml
+        #args: ["--line-length", "79", "--target-version", "py310"]
       #- id: black-jupyter
   - repo: https://github.com/scop/pre-commit-shfmt
     rev: v3.7.0-1
diff --git a/pyproject.toml b/pyproject.toml
new file mode 100644
index 0000000..2a2b459
--- /dev/null
+++ b/pyproject.toml
@@ -0,0 +1,22 @@
+# When changing this file, read also .pre-commit-config.yaml
+
+[tool.black]
+line-length = 79
+target-version = ['py310']
+
+[tool.mypy]
+#python-executable = 'pypy3'
+python-version = 3.10
+
+# https://black.readthedocs.io/en/stable/guides/using_black_with_other_tools.html
+
+# No need to have it uncommented since 79 is the standard.
+#[tool.pylint.format]
+#max-line-length = 79
+
+# Not actually used here, see .pre-commit-config.yaml for reorder-python-imports
+# that does the same thing.
+#[tool.isort]
+#profile = "black"
+
+# copy-pasted comments end.