diff --git a/TODO b/TODO
index ab51c01e..cdd5c3e5 100644
--- a/TODO
+++ b/TODO
@@ -24,6 +24,7 @@ Version 1.5.0:
 * Distributed clocks.
 * Bus simulator interface.
 * Implement ecrt_master_slave() in kernel space.
+* Implement EoE-locking callbacks for library.
 * Rename phy-commands to register commands.
 * Check for ioctl() interface version.