diff --git a/dev-python/dill/dill-0.3.8.ebuild b/dev-python/dill/dill-0.3.8.ebuild
index 9fb6c87da01e2..301fe58978d6a 100644
--- a/dev-python/dill/dill-0.3.8.ebuild
+++ b/dev-python/dill/dill-0.3.8.ebuild
@@ -4,6 +4,7 @@
 EAPI=8
 
 DISTUTILS_USE_PEP517=setuptools
+# py3.13: https://github.com/uqfoundation/dill/issues/654
 PYTHON_COMPAT=( python3_{10..12} pypy3 )
 
 inherit distutils-r1 pypi