Added a comment: why option vs manual chmod

diff --git a/doc/todo/unlock_--read-only/comment_3_305c1b867c38edf74cdff1638e5b1cfa._comment b/doc/todo/unlock_--read-only/comment_3_305c1b867c38edf74cdff1638e5b1cfa._comment
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+[[!comment format=mdwn
+ username="https://me.yahoo.com/a/EbvxpTI_xP9Aod7Mg4cwGhgjrCrdM5s-#7c0f4"
+ avatar="http://cdn.libravatar.org/avatar/8122123b4c2bc77187e32d7e025f7d445d7a08de1ba532237876a31159ac01da"
+ subject="why option vs manual chmod"
+ date="2016-10-17T23:11:10Z"
+ content="""
+as far as I see it
+
+- much easier to specify the option instead of figuring out which files were unlocked and need to be chmodded (some might be under git, etc)
+- probably would be notably (avoiding double file-tree traversal) faster in case of unlocking large number of files
+"""]]