diff --git a/src/lib.rs b/src/lib.rs
index afeb655..8188640 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -135,6 +135,8 @@ bitflags! {
         const CAN_ISOTP_FORCE_RXSTMIN = 0x100;
         /// different rx extended addressing
         const CAN_ISOTP_RX_EXT_ADDR = 0x200;
+        /// wait for tx completion
+        const CAN_ISOTP_WAIT_TX_DONE = 0x400;
     }
 }