diff --git a/changelog/2457.doc b/changelog/2457.doc
new file mode 100644
index 000000000..31d7aa1c2
--- /dev/null
+++ b/changelog/2457.doc
@@ -0,0 +1 @@
+Clarify that warning capturing doesn't change the warning filter by default.
\ No newline at end of file
diff --git a/doc/en/warnings.rst b/doc/en/warnings.rst
index f249d7e3b..d5a627aea 100644
--- a/doc/en/warnings.rst
+++ b/doc/en/warnings.rst
@@ -112,6 +112,12 @@ decorator or to all tests in a module by setting the ``pytestmark`` variable:
     pytestmark = pytest.mark.filterwarnings('error')
 
 
+.. note::
+
+    Except for these features, pytest does not change the python warning filter; it only captures
+    and displays the warnings which are issued with respect to the currently configured filter,
+    including changes to the filter made by test functions or by the system under test.
+
 .. note::
 
     ``DeprecationWarning`` and ``PendingDeprecationWarning`` are hidden by the standard library