docs: update changelog and versionadded
diff --git a/docs/advanced/functions.rst b/docs/advanced/functions.rst
index 984b046..3e33c9c 100644
--- a/docs/advanced/functions.rst
+++ b/docs/advanced/functions.rst
@@ -390,6 +390,8 @@
 Note that, as in Python, you cannot combine this with a ``py::args`` argument.
 This feature does *not* require Python 3 to work.
 
+.. versionadded:: 2.6
+
 .. _nonconverting_arguments:
 
 Non-converting arguments