diff --git a/docs/configuration.md b/docs/configuration.md
index 3420611e18..a88f71488f 100644
--- a/docs/configuration.md
+++ b/docs/configuration.md
@@ -352,6 +352,7 @@ For example, without `force-exclude` enabled, `ruff check /path/to/excluded/file
 ### Default inclusions
 
 By default, Ruff will discover files matching `*.py`, `*.pyi`, `*.ipynb`, or `pyproject.toml`.
+In [preview](preview.md) mode, Ruff will also discover `*.pyw` by default.
 
 To lint or format files with additional file extensions, use the [`extend-include`](settings.md#extend-include) setting.
 You can also change the default selection using the [`include`](settings.md#include) setting.