diff --git a/changes.md b/changes.md
index cb50c13da10..d34895bd111 100644
--- a/changes.md
+++ b/changes.md
@@ -71,6 +71,7 @@ writing Tcl scripts.
  - Introduced versioning of the `Tcl_ObjType` struct
  - Removed macros `CONST*`: Tcl 9 support means dropping Tcl 8.3 support.
    (Replaced with standard C `const` keyword going forward.)
+ - Removed registration of several `Tcl_ObjType`s.
  - Removed API functions:
 
      `Tcl_Backslash()`,
@@ -83,6 +84,8 @@ writing Tcl scripts.
      `Tcl_UniCharN(case)cmp()`,
      `Tcl_UniCharCaseMatch()`
 
+ - Revised many internals; beware reliance on undocumented behaviors.
+
 # New Features
 
 ## New commands