Add CHANGES note for [GL #3639]

diff --git a/CHANGES b/CHANGES
index 88d39ab1ce4a923e419f3c28f8b60d91d8ab6b85..ff656cca6d3edd631d9942577c962b13349f51d2 100644 (file)
--- a/CHANGES
+++ b/CHANGES
@@ -1,3 +1,8 @@
+6029.  [cleanup]       Remove the unused external cache cleaning mechanism
+                       as RBTDB has its own internal cache cleaning
+                       mechanism and we don't support any other database
+                       implementations. [GL #3639]
+
 6028.  [performance]   Build-time code generation of DNS RRtype switches
                        is now much faster. [GL !7121]