diff --git a/TODO b/TODO
index cb309c161ad3c0c8f6afcd629f667bbdf90e63e4..498d0da3f497999391bb588ceac28b820a21464d 100644
--- a/TODO
+++ b/TODO
@@ -14,6 +14,7 @@ Version 1.5.0:
     - Check 32/64 bit operations.
     - Use vendor correction factors when calculating transmission delays.
     - Use SYNC1 generation.
+    - Skip setting system time offset when application detaching.
 * Fix unloading problem of ec_e100 driver.
 * Use ec_datagram_zero() where possible.
 * Fix arguments of reg_read.