The message 2 is invalid: * The subject must start with a verb in imperative mood, but it started with: "Further". Whether the word is in imperative mood is determined by whitelisting. The general whitelist is available at https://github.com/mristin/opinionated-commit-message/blob/master/src/mostFrequentEnglishVerbs.ts. You can whitelist additional verbs using "additional-verbs" input to your GitHub action (currently no additional verbs were thus specified). Moreover, you can also whitelist additional verbs in a file given as "path-to-additional-verbs" input to your GitHub action (currently no whitelist file was specified). Please check the whitelist and either change the first word of the subject or whitelist the verb. The original message was: Further explain changelog entry