Improve error message for unresolved subtype ids.
diff --git a/release-notes/VERSION b/release-notes/VERSION
index 49e7205..1b70c41 100644
--- a/release-notes/VERSION
+++ b/release-notes/VERSION
@@ -72,6 +72,7 @@
that benefit from knowing number of elements in arrays (and would otherwise
need to buffer values to know length)
- Added new overload for `JsonSerializer.isEmpty()`, to eventually solve #588
+- Improve error messaging (related to [jaxb-annotations#38]) to include known subtype ids.
2.4.5 (not yet released)