diff --git a/blacklist.txt b/blacklist.txt
index 763199d653..09816a7054 100644
--- a/blacklist.txt
+++ b/blacklist.txt
@@ -14,7 +14,9 @@ pycodestyle
 pylint
 Pygments
 
-# Temporarily until tools/tox_install.sh is updated everywhere
+# The following horizon and Neutron libraries need to be blacklisted
+# as they do not use cycle-with-intermediary.  The only time they
+# would be updated is at release time.
 horizon
 networking-bagpipe
 networking-bgpvpn