diff --git a/asv.conf.json b/asv.conf.json
index 8a46664c35b09eae3cc104e98373cc7d58990a26..90133beb7af7d1a4b5bb23745b9cc543b1191d7b 100644
--- a/asv.conf.json
+++ b/asv.conf.json
@@ -75,6 +75,7 @@
         "pip+git+https://github.com/inducer/pymbolic#egg=pymbolic": [""],
         "pip+git+https://gitlab.tiker.net/inducer/boxtree#egg=boxtree": [""],
         "pip+git+https://github.com/inducer/loopy#egg=loopy": [""],
+        // https://github.com/pypa/pip/issues/8667
         "pip" : ["<20.2"],
     },