diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0d10b5dcf48..cba5a6cdd27 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,14 @@
+##
+
+### Tool Changes
+
+#### Analyzer
+
+* Support for `declarations-casts` has been removed and the `implicit-casts`
+  option now has the combined semantics of both options. This means that users
+  that disable `implicit-casts` might now see errors that were not previously
+  being reported.
+
 ## 2.2.0-dev.XX.0
 
 ### Dart for the Web
diff --git a/pkg/analyzer/CHANGELOG.md b/pkg/analyzer/CHANGELOG.md
index 6473d716468..9ef185feca2 100644
--- a/pkg/analyzer/CHANGELOG.md
+++ b/pkg/analyzer/CHANGELOG.md
@@ -1,3 +1,9 @@
+## 
+* Support for `declarations-casts` has been removed and the `implicit-casts`
+  option now has the combined semantics of both options. This means that users
+  that disable `implicit-casts` might now see errors that were not previously
+  being reported.
+
 ## 0.33.3
 * Backport Parsed/ResolvedLibraryResultImpl and ElementDeclarationResult.