The file extension is useful to trigger soft-wrapping of the text — GitHub avoids wrapping extension-less files, which makes the license hard to read in source form. It also makes it explicit that this is a text file (like the README.md), and allows emphasizing the title.
The title is not legally mandated, but it's convenient for human consumption, and is typically included in the template text of this license, as recommended by OSI, SPDX, choosealicense.com, and others.
The file extension is useful to trigger soft-wrapping of the text — GitHub avoids wrapping extension-less files, which makes the license hard to read in source form. It also makes it explicit that this is a text file (like the README.md), and allows emphasizing the title.
The title is not legally mandated, but it's convenient for human consumption, and is typically included in the template text of this license, as recommended by OSI, SPDX, choosealicense.com, and others.
Note: This PR is part of my personal project to improve the consistency and visibility of the ISC license in open source projects. See https://github.com/github/choosealicense.com/issues/377 for more details."