diff --git a/TODO.md b/TODO.md
new file mode 100644
index 0000000..8fe6fcc
--- /dev/null
+++ b/TODO.md
@@ -0,0 +1,14 @@
+# TODO
+
+## Threading API
+
+Still needs to be wrapped. How to handle `jack_native_thread_t` type?
+
+## Internal Clients
+
+Jack 1 and JACK 2 are disagreeing on the signatures of the functions for
+loading and getting a handles for internal clients:
+
+* https://github.com/jackaudio/jack2/blob/develop/common/jack/intclient.h#L66
+* https://github.com/jackaudio/headers/blob/2bfa5069718ca4f4dc091e0be845958f2d8a5ba8/intclient.h#L69
+* https://jackaudio.org/api/intclient_8h.html#a176a2daf66c8777eb1a845068fd7a822