diff --git a/CHANGELOG.md b/CHANGELOG.md
index fa29d7d21..655352349 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 ### Deprecated
 
+- Deprecate `DeclarationBlock::expandBackgroundShorthand()` (#573)
 - Deprecate `DeclarationBlock::expandFontShorthand()` (#572)
 - Deprecate `DeclarationBlock::expandDimensionsShorthand()` (#571)
 - Deprecate `DeclarationBlock::expandBorderShorthand()` (#570)
diff --git a/src/RuleSet/DeclarationBlock.php b/src/RuleSet/DeclarationBlock.php
index 5840a0873..790b9d810 100644
--- a/src/RuleSet/DeclarationBlock.php
+++ b/src/RuleSet/DeclarationBlock.php
@@ -391,6 +391,8 @@ public function expandFontShorthand()
      * @see http://www.w3.org/TR/21/colors.html#propdef-background
      *
      * @return void
+     *
+     * @deprecated This will be removed without substitution in version 10.0.
      */
     public function expandBackgroundShorthand()
     {