caveat       
noun [ C ]  formal uk/ˈkæv.i.æt/ us/ˈkæv.i.æt/
 (进一步行动前的)警告,告诫;限制条款
a warning to consider something before taking any more action, or a statement that limits a more general statement
  He agreed to the interview, with the caveat that he could approve the final article. 他答应接受访问,条件是访问稿刊登前须经他同意。 
 Synonym: proviso