diff --git a/include/i2c.h b/include/i2c.h
index ccffc19..a5c760c 100644
--- a/include/i2c.h
+++ b/include/i2c.h
@@ -68,9 +68,11 @@
  * I2C bus udevice.
  *
  * @speed_hz: Bus speed in hertz (typically 100000)
+ * @max_transaction_bytes: Maximal size of single I2C transfer
  */
 struct dm_i2c_bus {
 	int speed_hz;
+	int max_transaction_bytes;
 };
 
 /*