diff --git a/CHANGELOG.md b/CHANGELOG.md
index 28cbe9e3..3b210434 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -18,6 +18,7 @@ This project adheres to [Semantic Versioning](https://semver.org/).
 
 ### Deprecated
 
+- Deprecate `Document::expandShorthands()` (#566)
 - Deprecate `Document::createShorthands()` (#567)
 - Deprecate `DeclarationBlock::expandShorthands()` (#558)
 
diff --git a/src/CSSList/Document.php b/src/CSSList/Document.php
index 983644d4..4fc92618 100644
--- a/src/CSSList/Document.php
+++ b/src/CSSList/Document.php
@@ -116,6 +116,8 @@ public function getSelectorsBySpecificity($sSpecificitySearch = null)
      * Expands all shorthand properties to their long value.
      *
      * @return void
+     *
+     * @deprecated This will be removed without substitution in version 10.0.
      */
     public function expandShorthands()
     {