diff --git a/defoam.md b/defoam.md
index 91ba3c911..4e50250b9 100644
--- a/defoam.md
+++ b/defoam.md
@@ -3,3 +3,5 @@
 - to remove all such cruft from a [[digital garden]], you can use the following one-liner:
 	- `sed -i '/\[\/\/begin\]/,/\[\/end\]/d' *md`
 	- sed is "native" to [[linux]] and [[os x]] but these days should be installable in windows through [[wsl]].
+	
+https://twitter.com/flancian/status/1391436411501416452
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