The phrase "additional credibility" means having more trust or belief in something or someone because they have given more evidence or proof to support their claims. Full definition
Having strong legal representation provides you and your company with additional credibility. (marsdd.com)
Get certified and earn additional credibility by demonstrating your commitment to your professional development. (iahcnow.org)
What better way to show what you have to offer than to have other travel enthusiasts read about you for themselves, providing you with additional credibility. (travelweeklyawards.com)