diff --git a/src/trio.org b/src/trio.org
index 6262792..d4fcca4 100644
--- a/src/trio.org
+++ b/src/trio.org
@@ -830,3 +830,5 @@ trio_exit_code trio_text_write_nucleus_charge(const trio_t* file, const double*
 * TODO Things to be done                                           :noexport:
   - [ ] Thread safety
   - [ ] Error handling with errno
+  - [ ] File locking with flock
+  - [ ] Caching of the struct saving last modification date in structs