diff --git a/.pre-commit-config.yaml b/.pre-commit-config.yaml
index 70abc6ef48..30f0c86dac 100644
--- a/.pre-commit-config.yaml
+++ b/.pre-commit-config.yaml
@@ -18,6 +18,10 @@ repos:
     rev: "2.4.3"
     hooks:
       - id: pyproject-fmt
+  - repo: https://github.com/abravalheri/validate-pyproject
+    rev: "v0.21"
+    hooks:
+      - id: validate-pyproject
   - repo: https://github.com/astral-sh/ruff-pre-commit
     rev: "v0.7.0"
     hooks:
diff --git a/docs/changelog/3240.doc.rst b/docs/changelog/3240.doc.rst
new file mode 100644
index 0000000000..751e1aa0ab
--- /dev/null
+++ b/docs/changelog/3240.doc.rst
@@ -0,0 +1 @@
+Fix bad example in documentation for dependency groups - by :user:`gaborbernat`.
diff --git a/docs/config.rst b/docs/config.rst
index 9df1eae798..b1bb25ac47 100644
--- a/docs/config.rst
+++ b/docs/config.rst
@@ -839,13 +839,13 @@ Python run
 
        .. code-block:: toml
 
-          [dependency_groups]
+          [dependency-groups]
           test = [
              "pytest>=8",
           ]
 
           [tool.tox.env_run_base]
-          dependency-groups = [
+          dependency_groups = [
             "test",
           ]
 
diff --git a/docs/index.rst b/docs/index.rst
index f4222031e5..d58b9fd991 100644
--- a/docs/index.rst
+++ b/docs/index.rst
@@ -22,7 +22,7 @@ and `devpi <https://www.devpi.net>`_).
   :target: https://pypistats.org/packages/tox
   :alt: PyPI - Downloads
 .. image:: https://img.shields.io/pypi/l/tox?style=flat-square
-  :target: https://opensource.org/blog/license/mit
+  :target: https://opensource.org/license/mit
   :alt: PyPI - License
 .. image:: https://img.shields.io/github/issues/tox-dev/tox?style=flat-square
   :target: https://github.com/tox-dev/tox/issues