diff --git a/compare.html b/compare.html
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+++ b/compare.html
@@ -200,7 +200,7 @@ ZFS also employs a suboptimal RAID-Z3 algorithm that requires roughly twice the
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 <p>
-<a id="note4">[4]</a> - unRAID completely rebuilds parity when adding a new disk that already contains data, and during this process the existing data in the array is not protected.
+<a id="note4">[4]</a> - unRAID completely rebuilds parity when adding a new disk that already contains data, and during this process <a href="https://youtu.be/frtauLMO3-c?t=803">the existing data in the array is not protected</a>.
 This is a serious flaw, as a full parity rebuild puts considerable stress on all drives. If any disk is near failure, there’s a high risk it could fail during this operation.
 The only safe way to add a new data disk is to pre-clear it first.
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