diff --git a/core/modules/block/custom_block/custom_block.local_actions.yml b/core/modules/block/custom_block/custom_block.local_actions.yml
index a9fd0c0..e69e92c 100644
--- a/core/modules/block/custom_block/custom_block.local_actions.yml
+++ b/core/modules/block/custom_block/custom_block.local_actions.yml
@@ -1,10 +1,10 @@
-custom_block.type_add.action:
+custom_block.type_add.action: # The plugin ID
   route_name: custom_block.type_add
   title: 'Add custom block type'
   appears_on:
     - custom_block.type_list
 
-custom_block.add_page.action:
+custom_block.add_page.action: # The plugin ID
   route_name: custom_block.add_page
   title: 'Add custom block'
   appears_on:
diff --git a/core/modules/forum/forum.local_actions.yml b/core/modules/forum/forum.local_actions.yml
index 0245a45..9fc6785 100644
--- a/core/modules/forum/forum.local_actions.yml
+++ b/core/modules/forum/forum.local_actions.yml
@@ -1,10 +1,10 @@
-forum.add_forum.action:
+forum.add_forum.action: # The plugin ID
   route_name: forum.add_forum
   title: 'Add forum'
   appears_on:
     - forum.overview
 
-forum.add_container.action:
+forum.add_container.action: # The plugin ID
   route_name: forum.add_container
   title: 'Add container'
   appears_on:
diff --git a/core/modules/language/language.local_actions.yml b/core/modules/language/language.local_actions.yml
index 786960d..7daa433 100644
--- a/core/modules/language/language.local_actions.yml
+++ b/core/modules/language/language.local_actions.yml
@@ -1,4 +1,4 @@
-language.add.action:
+language.add.action: # The plugin ID
   route_name: language.add
   title: 'Add language'
   appears_on:
diff --git a/core/modules/system/tests/modules/menu_test/menu_test.local_actions.yml b/core/modules/system/tests/modules/menu_test/menu_test.local_actions.yml
index ca36029..9797ac9 100644
--- a/core/modules/system/tests/modules/menu_test/menu_test.local_actions.yml
+++ b/core/modules/system/tests/modules/menu_test/menu_test.local_actions.yml
@@ -1,24 +1,24 @@
-menu_test.local_action3.action:
+menu_test.local_action3.action: # The plugin ID
   route_name: menu_test.local_action3
   title: 'My YAML discovery action'
   appears_on:
     - menu_test.local_action1
 
-menu_test.local_action5.action:
+menu_test.local_action5.action: # The plugin ID
   route_name: menu_test.local_action5
   class: '\Drupal\menu_test\Plugin\Menu\LocalAction\TestLocalAction'
   weight: 10
   appears_on:
     - menu_test.local_action1
 
-menu_test.local_action2.action:
+menu_test.local_action2.action: # The plugin ID
   route_name: menu_test.local_action2
   title: 'My hook_menu action'
   weight: -10
   appears_on:
     - menu_test.local_action1
 
-menu_test.local_action4.action:
+menu_test.local_action4.action: # The plugin ID
   route_name: menu_test.local_action4
   title: 'My dynamic title action'
   weight: -20
@@ -26,19 +26,19 @@ menu_test.local_action4.action:
   appears_on:
     - menu_test.local_action1
 
-menu_test.hidden_menu_add.action:
+menu_test.hidden_menu_add.action: # The plugin ID
   route_name: menu_test.hidden_menu_add
   title: 'Add menu'
   appears_on:
     - menu_test.hidden_menu
 
-menu_test.hidden_manage_add.action:
+menu_test.hidden_manage_add.action: # The plugin ID
   route_name: menu_test.hidden_manage_add
   title: 'Add link'
   appears_on:
     - menu_test.hidden_manage
 
-menu_test.hidden_block_add:
+menu_test.hidden_block_add: # The plugin ID
   route_name: menu_test.hidden_block_add
   title: 'Add block'
   appears_on:
diff --git a/core/modules/taxonomy/taxonomy.local_actions.yml b/core/modules/taxonomy/taxonomy.local_actions.yml
index f799582..2c66214 100644
--- a/core/modules/taxonomy/taxonomy.local_actions.yml
+++ b/core/modules/taxonomy/taxonomy.local_actions.yml
@@ -1,10 +1,10 @@
-taxonomy.vocabulary_add.action:
+taxonomy.vocabulary_add.action: # The plugin ID
   route_name: taxonomy.vocabulary_add
   title: 'Add vocabulary'
   appears_on:
     - taxonomy.vocabulary_list
 
-taxonomy.term_add.action:
+taxonomy.term_add.action: # The plugin ID
   route_name: taxonomy.term_add
   title: 'Add term'
   appears_on:
diff --git a/core/modules/tour/tests/tour_test/tour_test.local_actions.yml b/core/modules/tour/tests/tour_test/tour_test.local_actions.yml
index cb1b493..a1e2e9c 100644
--- a/core/modules/tour/tests/tour_test/tour_test.local_actions.yml
+++ b/core/modules/tour/tests/tour_test/tour_test.local_actions.yml
@@ -1,4 +1,4 @@
-tour_test.1_action.action:
+tour_test.1_action.action: # The plugin ID
   route_name: tour_test.1_action
   title: 'Tour test action'
   appears_on:
diff --git a/core/modules/views_ui/views_ui.local_actions.yml b/core/modules/views_ui/views_ui.local_actions.yml
index 9ae3190..4def164 100644
--- a/core/modules/views_ui/views_ui.local_actions.yml
+++ b/core/modules/views_ui/views_ui.local_actions.yml
@@ -1,4 +1,4 @@
-views.add.action:
+views_ui.add.action: # The plugin ID
   route_name: views_ui.add
   title: 'Add new view'
   appears_on: