diff --git a/doc/todo/key_checksum_from_chunk_checksums/comment_1_946e2679cafd2c74a3b0b408e39f2d8d._comment b/doc/todo/key_checksum_from_chunk_checksums/comment_1_946e2679cafd2c74a3b0b408e39f2d8d._comment
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+[[!comment format=mdwn
+ username="joey"
+ subject="""comment 1"""
+ date="2019-05-06T16:10:17Z"
+ content="""
+Parallizable checksums exist, I would rather add support for a standard one
+to git-annex than roll my own. In fact, I already did when I added
+BLAKE2SP224 etc which are 8-way parallel and also can be optimised by SIMD
+instructions on less parallel systems.
+"""]]