Add Custom Dictionary Words

When editing a file with spell turned on, you may find vim highlighting some of your content in red. This red highlighting indicates a misspelling. Sure, these words technically aren't going to show up in something like the Merriam-Webster dictionary, but as far as you are concerned, they are words. They are part of your internal, shared language. The word admin is a great example. Why not just tell vim once and for all that such words are valid.

You can do just that by moving your cursor over the misspelled word and hitting zg. That will add it to the spellfile, a list of words, which vim includes in its spell checking. This means vim will no longer highlight that word red.