diff --git a/semaphore/semaphore.go b/semaphore/semaphore.go
index ac53e73..7f096fe 100644
--- a/semaphore/semaphore.go
+++ b/semaphore/semaphore.go
@@ -95,7 +95,7 @@ func (s *Weighted) Release(n int64) {
 	s.cur -= n
 	if s.cur < 0 {
 		s.mu.Unlock()
-		panic("semaphore: bad release")
+		panic("semaphore: released more than held")
 	}
 	for {
 		next := s.waiters.Front()