diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0399c470..a9e17e58 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 ### Deprecated
 
+- Deprecate `DeclarationBlock::expandBorderShorthand()` (#570)
 - Deprecate `DeclarationBlock::createShorthands()` (#569)
 - Deprecate `Document::expandShorthands()` (#566)
 - Deprecate `Document::createShorthands()` (#567)
diff --git a/src/RuleSet/DeclarationBlock.php b/src/RuleSet/DeclarationBlock.php
index a2ea65d6..9ca60347 100644
--- a/src/RuleSet/DeclarationBlock.php
+++ b/src/RuleSet/DeclarationBlock.php
@@ -196,6 +196,8 @@ public function createShorthands()
      * Multiple borders are not yet supported as of 3.
      *
      * @return void
+     *
+     * @deprecated This will be removed without substitution in version 10.0.
      */
     public function expandBorderShorthand()
     {