Make it more obvious that warnings.catch_warnings() and its arguments should be considered keyword-only.
diff --git a/Doc/library/warnings.rst b/Doc/library/warnings.rst
index aaf7897..68bc261 100644
--- a/Doc/library/warnings.rst
+++ b/Doc/library/warnings.rst
@@ -267,7 +267,7 @@
Available Classes
-----------------
-.. class:: catch_warnings([record=False[, module=None]])
+.. class:: catch_warnings([\*, record=False[, module=None]])
A context manager that guards the warnings filter from being permanently
mutated. The manager returns an instance of :class:`WarningsRecorder`. The