diff --git a/README.md b/README.md
index 56bffc6..7e21bc1 100644
--- a/README.md
+++ b/README.md
@@ -36,6 +36,7 @@ TODO
 
 * [ ] speed up udev_enumerate_scan_devices()
   - [x] threads
+  - [ ] [readfile()](https://lwn.net/Articles/813827/)
   - [ ] deferred plugging via udev_monitor_receive_device()
   - [ ] ~~caching~~ impossible to implement
 * [ ] implement hotplugging support