diff --git a/core/modules/system/src/Plugin/Block/SystemBrandingBlock.php b/core/modules/system/src/Plugin/Block/SystemBrandingBlock.php
index c45b739..d4587b8 100644
--- a/core/modules/system/src/Plugin/Block/SystemBrandingBlock.php
+++ b/core/modules/system/src/Plugin/Block/SystemBrandingBlock.php
@@ -22,7 +22,8 @@
  *
  * @Block(
  *   id = "system_branding_block",
- *   admin_label = @Translation("Site branding")
+ *   admin_label = @Translation("Site branding"),
+ *   category = @Translation("System")
  * )
  */
 class SystemBrandingBlock extends BlockBase implements ContainerFactoryPluginInterface {
diff --git a/core/modules/system/src/Plugin/Block/SystemBreadcrumbBlock.php b/core/modules/system/src/Plugin/Block/SystemBreadcrumbBlock.php
index a863bac..bf4a5ac 100644
--- a/core/modules/system/src/Plugin/Block/SystemBreadcrumbBlock.php
+++ b/core/modules/system/src/Plugin/Block/SystemBreadcrumbBlock.php
@@ -18,7 +18,8 @@
  *
  * @Block(
  *   id = "system_breadcrumb_block",
- *   admin_label = @Translation("Breadcrumbs")
+ *   admin_label = @Translation("Breadcrumbs"),
+ *   category = @Translation("System")
  * )
  */
 class SystemBreadcrumbBlock extends BlockBase implements ContainerFactoryPluginInterface {
diff --git a/core/modules/system/src/Plugin/Block/SystemMainBlock.php b/core/modules/system/src/Plugin/Block/SystemMainBlock.php
index 92475ab..4ad4590 100644
--- a/core/modules/system/src/Plugin/Block/SystemMainBlock.php
+++ b/core/modules/system/src/Plugin/Block/SystemMainBlock.php
@@ -17,7 +17,8 @@
  *
  * @Block(
  *   id = "system_main_block",
- *   admin_label = @Translation("Main page content")
+ *   admin_label = @Translation("Main page content"),
+ *   category = @Translation("System")
  * )
  */
 class SystemMainBlock extends BlockBase implements MainContentBlockPluginInterface {
diff --git a/core/modules/system/src/Plugin/Block/SystemMessagesBlock.php b/core/modules/system/src/Plugin/Block/SystemMessagesBlock.php
index c1d78fb..ca5469d 100644
--- a/core/modules/system/src/Plugin/Block/SystemMessagesBlock.php
+++ b/core/modules/system/src/Plugin/Block/SystemMessagesBlock.php
@@ -19,7 +19,8 @@
  *
  * @Block(
  *   id = "system_messages_block",
- *   admin_label = @Translation("Messages")
+ *   admin_label = @Translation("Messages"),
+ *   category = @Translation("System")
  * )
  */
 class SystemMessagesBlock extends BlockBase implements MessagesBlockPluginInterface {
diff --git a/core/modules/system/src/Plugin/Block/SystemPoweredByBlock.php b/core/modules/system/src/Plugin/Block/SystemPoweredByBlock.php
index db76b80..c22bd47 100644
--- a/core/modules/system/src/Plugin/Block/SystemPoweredByBlock.php
+++ b/core/modules/system/src/Plugin/Block/SystemPoweredByBlock.php
@@ -16,7 +16,8 @@
  *
  * @Block(
  *   id = "system_powered_by_block",
- *   admin_label = @Translation("Powered by Drupal")
+ *   admin_label = @Translation("Powered by Drupal"),
+ *   category = @Translation("System")
  * )
  */
 class SystemPoweredByBlock extends BlockBase {