Add changelog entry

agronholm · Jan 29, 2025 · 08bf558 · 08bf558
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diff --git a/docs/versionhistory.rst b/docs/versionhistory.rst
@@ -3,6 +3,12 @@ Version history
 
 This library adheres to `Semantic Versioning 2.0 <http://semver.org/>`_.
 
+ **UNRELEASED**
+- Fixed traceback formatting growing quadratically with level of ``TaskGroup``
+  nesting on asyncio due to exception chaining when raising ``ExceptionGroups``
+  in ``TaskGroup.__aexit__``
+  (`#863 <https://github.com/agronholm/anyio/issues/863>`_; PR by @tapetersen)
+
 **4.8.0**
 
 - Added **experimental** support for running functions in subinterpreters on Python