[libc++][doc] Add a todo.
As suggested in D113831.
GitOrigin-RevId: f0bb6c760c203cb760de08dba3376ba16e981d32
diff --git a/include/format b/include/format
index e1002e7..ce16857 100644
--- a/include/format
+++ b/include/format
@@ -313,6 +313,8 @@
// to support compilers with partial C++20 support.
#if !defined(_LIBCPP_HAS_NO_CONCEPTS)
+// TODO FMT Move the implementation in this file to its own granular headers.
+
// TODO FMT Evaluate which templates should be external templates. This
// improves the efficiency of the header. However since the header is still
// under heavy development and not all classes are stable it makes no sense
