extends: metric message: "Try to keep the Flesch-Kincaid grade level (%s) below 8." link: https://en.wikipedia.org/wiki/Flesch%E2%80%93Kincaid_readability_tests formula: | (0.39 * (words / sentences)) + (11.8 * (syllables / words)) - 15.59 condition: "> 8" level: suggestion