hin or chin?

[Beregond]

Note that the title of the Narn is given as Narn i Hîn Húrin in the published Silmarillion and Unfinished Tales. This was an editorial decision by Christopher Tolkien which he later regretted, done only to prevent people from pronouncing Chîn like the English "chin".

This from Tolkien Gateway. Where they got this information I am not sure - I scanned The Children of Hurin itself without finding any passage by Christopher related to it. Maybe it's in a revised Silmarillion? However, it is probably true, what Tolkien Gateway says.

[Beregond]

Another site says:

In LR:322, Christopher Tolkien confesses: "Narn i Chîn Húrin...is so spelt at all occurences, but was improperly changed by me to Narn i Hîn Húrin (because I did not want Chîn to be pronounced like Modern English chin.)

Does LR mean Lost Road?