diff --git a/core/CHANGELOG.txt b/core/CHANGELOG.txt
index 4d0f896435..46fd910f1a 100644
--- a/core/CHANGELOG.txt
+++ b/core/CHANGELOG.txt
@@ -367,6 +367,10 @@ stable in time for 8.4.0! Notable improvements in this release:
   If your contributed module refers to revisions that are not yet published, it
   should use this new term.
 
+As per the experimental module process, there were some backwards incompatible
+changes since Drupal 8.3.x. Experimental modules do not offer a supported
+upgrade path, but [an unofficial upgrade path is being worked on](https://www.drupal.org/node/2896630).
+
 #### Field Layout ([alpha stability](https://www.drupal.org/core/experimental#alpha))
 
 This module provides the ability for site builders to rearrange fields on