diff --git a/doc/notes/notes-9.18.15.rst b/doc/notes/notes-9.18.15.rst
index 49b2f23e92..20a770a8ca 100644
--- a/doc/notes/notes-9.18.15.rst
+++ b/doc/notes/notes-9.18.15.rst
@@ -31,6 +31,10 @@ Bug Fixes
   as broken and is not contacted again during a given resolution
   process. :gl:`#4005`
 
+- When removing delegations from an opt-out range, empty-non-terminal
+  NSEC3 records generated by those delegations were not cleaned up. This
+  has been fixed. :gl:`#4027`
+
 - Log file rotation code did not clean up older versions of log files
   when the logging :any:`channel` had an absolute path configured as a
   ``file`` destination. This has been fixed. :gl:`#3991`