diff --git a/src/pages/ProjectDetail.tsx b/src/pages/ProjectDetail.tsx
index 511b35d..0fb69ab 100644
--- a/src/pages/ProjectDetail.tsx
+++ b/src/pages/ProjectDetail.tsx
@@ -503,7 +503,7 @@ function MailTab({ projectId }: { projectId: string }) {
     <div>
       <div className="flex items-center justify-between mb-3 gap-2 flex-wrap">
         <p className="text-sm text-ink-secondary">
-          <span className="font-medium text-ink">@{data.domain}</span> 와(과) 주고받은 메일 · 프로젝트 팀 메일함 집계
+          <span className="font-medium text-ink">@{data.domain}</span> 와(과) 주고받은 메일 · <span className="text-ink-muted">내가 수신·참조(CC)된 메일만 표시</span>
         </p>
         {data.error && <span className="text-xs text-status-pending-fg">일부 메일함을 읽지 못했습니다</span>}
       </div>