Fix typo, add comment.
Fix typo, add comment.

karies/cling,marsupial/cling,karies/cling,root-mirror/cling,root-mirror/cling,root-mirror/cling,marsupial/cling,root-mirror/cling,karies/cling,root-mirror/cling,marsupial/cling,karies/cling,marsupial/cling,marsupial/cling,marsupial/cling,karies/cling,karies/cling,root-mirror/cling