diff --git a/docs/source/user/configuration.rst b/docs/source/user/configuration.rst
index 70fc22b..8fa0e70 100644
--- a/docs/source/user/configuration.rst
+++ b/docs/source/user/configuration.rst
@@ -25,7 +25,7 @@ Configuration Locations
 =======================
 
 |Flake8| supports storing its configuration in your project in one of
-``setup.cfg``, ``tox.ini``, or ``.flake8``.
+``setup.cfg``, ``tox.ini``, or ``.flake8``, but not ``pyproject.toml``.
 
 Values set at the command line have highest priority, then those in the
 project configuration file, and finally there are the defaults. However,