diff --git a/README.md b/README.md
index d155f52..9c4bec6 100644
--- a/README.md
+++ b/README.md
@@ -39,9 +39,9 @@ File watcher     | yes²              | yes²             | yes               |
 ² Currently only supported on Linux
 
 
-Open questions
---------------
+### Open questions
 
 - Error code reporting
 - Adopting existing file descriptors (done for files)
 - Enqueued writes
+- Use the type system to prohibit passing thread-local handles to foreign threads