diff --git a/lib/src/transaction.rs b/lib/src/transaction.rs
index 2bee205d4..92ef75768 100644
--- a/lib/src/transaction.rs
+++ b/lib/src/transaction.rs
@@ -195,7 +195,7 @@ impl<'r> Transaction<'r> {
 impl<'r> Drop for Transaction<'r> {
     fn drop(&mut self) {
         if !std::thread::panicking() {
-            assert!(self.closed);
+            assert!(self.closed, "Transaction was dropped without being closed.");
         }
     }
 }