diff --git a/dev-python/cloudpickle/cloudpickle-3.0.0.ebuild b/dev-python/cloudpickle/cloudpickle-3.0.0.ebuild
index f840b44245798..f0be98a6dc11a 100644
--- a/dev-python/cloudpickle/cloudpickle-3.0.0.ebuild
+++ b/dev-python/cloudpickle/cloudpickle-3.0.0.ebuild
@@ -4,6 +4,7 @@
 EAPI=8
 
 DISTUTILS_USE_PEP517=flit
+# py3.13: https://github.com/cloudpipe/cloudpickle/issues/533
 PYTHON_COMPAT=( pypy3 python3_{10..12} )
 
 inherit distutils-r1