Default AOSP Keyboard won't autocorrect thursday to Thursday

My AOSP keyboard seems to have forgotten that thursday should be capitalized. I think it happened from typing thursday, auto correcting to Thursday by pressing space, and then I press backspace because I forgot I wanted to put a comma after the word, so it undoes the autocorrect, and it thinks I don't want it to autocorrect the capital letter.

I believe the Google keyboard, downloadable in the app store, has a fix for this where you can go to the settings and have it forget everything it's learned like that. The AOSP keyboard doesn't seem to have this option.

I also read that a solution is to clear the data of whatever process handles autocorrect, but that was for a proprietary ROM and keyboard, and I can't find anything like that in my CM11 ROM.

Any ideas how I might fix this?