Fix #1799
diff --git a/release-notes/VERSION b/release-notes/VERSION
index 25a2d00..f62ca3a 100644
--- a/release-notes/VERSION
+++ b/release-notes/VERSION
@@ -6,6 +6,7 @@
 2.9.3 (not yet released)
 
 #1604: Nested type arguments doesn't work with polymorphic types
+#1799: Allow creation of custom sub-types of `NullNode`, `BooleanNode`, `MissingNode`
 #1804: `ValueInstantiator.canInstantiate()` ignores `canCreateUsingArrayDelegate()`
  (reported byb henryptung@github)