diff --git a/Works-in-progress.md b/Works-in-progress.md
index a08b797..609f6bb 100644
--- a/Works-in-progress.md
+++ b/Works-in-progress.md
@@ -41,6 +41,7 @@
     - [ ] `flat_tree`
     - [ ] UTF-8 `string` (See BigJ's string)
         - [ ] UTF-8 range identification function
+    - [ ] CBOR parser and serializer
     - [ ] `tuple`
     - Filesystems
         - [ ] `generic_filesystem` type erasing wrapper (`gp::function` style?)