diff --git a/doc/devblog/day_641__an_alternative_smudge_filter/comment_9_3129a6da37ba7a1f8ee11441b7ed4d07._comment b/doc/devblog/day_641__an_alternative_smudge_filter/comment_9_3129a6da37ba7a1f8ee11441b7ed4d07._comment
new file mode 100644
index 0000000000..2c0bf035c7
--- /dev/null
+++ b/doc/devblog/day_641__an_alternative_smudge_filter/comment_9_3129a6da37ba7a1f8ee11441b7ed4d07._comment
@@ -0,0 +1,8 @@
+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 9"""
+ date="2022-09-13T18:15:19Z"
+ content="""
+This has been implemented for a while, see [[day_642__cost_model]]
+for how I got around the dilemma. Upgrade to repository v9 to use it.
+"""]]