diff --git a/TODO b/TODO
index 8e2f52dc..833cdf60 100644
--- a/TODO
+++ b/TODO
@@ -14,6 +14,7 @@ Version 1.5.0:
     - Use common application time offset when setting start times.
     - Check 32/64 bit operations.
     - Set system time offset only when application time available.
+    - Use vendor correction factors when calculating transmission delays.
 * Fix unloading problem of ec_e100 driver.
 * Use ec_datagram_zero() where possible.
 * Fix arguments of reg_read.