diff --git a/doc/todo/alternate_keys_for_same_content/comment_2_0f464f4970e499371fcb65e0d06202cf._comment b/doc/todo/alternate_keys_for_same_content/comment_2_0f464f4970e499371fcb65e0d06202cf._comment
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+[[!comment format=mdwn
+ username="Ilya_Shlyakhter"
+ avatar="http://cdn.libravatar.org/avatar/1647044369aa7747829c38b9dcc84df0"
+ subject="alternate keys"
+ date="2020-01-31T19:23:35Z"
+ content="""
+\"every time something about a key is looked up in the git-annex branch, it would also need to look at the metadata to see if this alt_keys field is set\" -- not every time, just when checking if the key is checksum-based, and if content matches the checksum.  Also, isn't metadata [[cached in a database|design/caching_database]]?
+"""]]