diff --git a/CHANGES.md b/CHANGES.md
index 293f2c200bf0..e1558909518d 100644
--- a/CHANGES.md
+++ b/CHANGES.md
@@ -84,6 +84,8 @@
   TextIO) and will now need to declare the dependency.
 * `beam-sdks-java-core` is no longer a dependency of the Java SDK Harness. Users of a portable
   runner (such as Dataflow Runner v2) will need to provide this package and its dependencies.
+* Slices now use the Beam Iterable Coder. This enables cross language use, but breaks pipeline updates
+  if a Slice type is used as a PCollection element or State API element. (Go)[#24339](https://github.com/apache/beam/issues/24339)
 
 ## Deprecations