diff -u b/core/lib/Drupal/Component/PhpStorage/FileReadOnlyStorage.php b/core/lib/Drupal/Component/PhpStorage/FileReadOnlyStorage.php
--- b/core/lib/Drupal/Component/PhpStorage/FileReadOnlyStorage.php
+++ b/core/lib/Drupal/Component/PhpStorage/FileReadOnlyStorage.php
@@ -69,7 +69,7 @@
    * {@inheritdoc}
    */
   public function writeable() {
-    @trigger_error('It is deprecated in drupal:9.1.0 and will be removed in drupal:10.0.0. https://www.drupal.org/project/drupal/issues/2898947', E_USER_DEPRECATED);
+    @trigger_error('writeable() is deprecated in Drupal:9.0.0 and will be removed from Drupal:10.0.0. See https://www.drupal.org/project/drupal/issues/2898947', E_USER_DEPRECATED);
 
     return $this->writable();
   }
diff -u b/core/lib/Drupal/Component/PhpStorage/FileStorage.php b/core/lib/Drupal/Component/PhpStorage/FileStorage.php
--- b/core/lib/Drupal/Component/PhpStorage/FileStorage.php
+++ b/core/lib/Drupal/Component/PhpStorage/FileStorage.php
@@ -148,7 +148,7 @@
    * {@inheritdoc}
    */
   public function writeable() {
-    @trigger_error('It is deprecated in drupal:9.1.0 and will be removed in drupal:10.0.0. https://www.drupal.org/project/drupal/issues/2898947', E_USER_DEPRECATED);
+    @trigger_error('writeable() is deprecated in Drupal:9.0.0 and will be removed from Drupal:10.0.0. See https://www.drupal.org/project/drupal/issues/2898947', E_USER_DEPRECATED);
 
     return $this->writable();
   }
diff -u b/core/lib/Drupal/Component/PhpStorage/PhpStorageBase.php b/core/lib/Drupal/Component/PhpStorage/PhpStorageBase.php
--- b/core/lib/Drupal/Component/PhpStorage/PhpStorageBase.php
+++ b/core/lib/Drupal/Component/PhpStorage/PhpStorageBase.php
@@ -8,11 +8,9 @@
-abstract class PhpStorageBase {
+abstract class PhpStorageBase implements PhpStorageInterface {
 
   /**
-   * Changed "writeable" to "writable".
+   * Whether this is a writable storage
    *
-   * It is deprecated in drupal:9.1.0 and will be removed in drupal:10.0.0.
-   *
-   * @see https://www.drupal.org/project/drupal/issues/2898947
+   * @return bool
    */
     abstract public function writable();
-}
\ No newline at end of file
+}
diff -u b/core/lib/Drupal/Component/PhpStorage/PhpStorageInterface.php b/core/lib/Drupal/Component/PhpStorage/PhpStorageInterface.php
--- b/core/lib/Drupal/Component/PhpStorage/PhpStorageInterface.php
+++ b/core/lib/Drupal/Component/PhpStorage/PhpStorageInterface.php
@@ -54,11 +54,11 @@
   /**
    * Whether this is a writeable storage.
    *
-   * @deprecated in drupal:9.1.0 and is removed from drupal:10.0.0.
-   * 
+   * @deprecated in Drupal:9.0.0 and will be removed from Drupal:10.0.0.
+   *
    * @return bool
    */
-  public function writable();
+  public function writeable();
 
   /**
    * Deletes PHP code from storage.