How do I force the comment field to be mandatory?

[Yaniv Vararu]

This question is in reference to Atlassian Documentation: How to add a comment during a transition

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[MattS]

I seem to recall doing this with the Behaviours feature in the ScriptRunner add-on

[Elifcan Cakmak]

hello

you can't do that without a plugin. you need JIRA misc workflow extension.

https://confluence.atlassian.com/jirakb/how-to-configure-comment-field-to-be-required-in-workflow-transition-648381476.html