diff --git a/core/modules/aggregator/lib/Drupal/aggregator/FeedInterface.php b/core/modules/aggregator/lib/Drupal/aggregator/FeedInterface.php
index 25e5128..1f56021 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/FeedInterface.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/FeedInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Entity\ContentEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining an aggregator feed entity.
  */
 interface FeedInterface extends ContentEntityInterface {
 
diff --git a/core/modules/aggregator/lib/Drupal/aggregator/ItemInterface.php b/core/modules/aggregator/lib/Drupal/aggregator/ItemInterface.php
index 29a94bf..5228925 100644
--- a/core/modules/aggregator/lib/Drupal/aggregator/ItemInterface.php
+++ b/core/modules/aggregator/lib/Drupal/aggregator/ItemInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Entity\ContentEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining an aggregator item entity.
  */
 interface ItemInterface extends ContentEntityInterface {
 
diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockInterface.php b/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockInterface.php
index 1006ef5..e620031 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockInterface.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Entity\ContentEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a custom block entity.
  */
 interface CustomBlockInterface extends ContentEntityInterface {
 
diff --git a/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockTypeInterface.php b/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockTypeInterface.php
index 6855785..fbbcd0c 100644
--- a/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockTypeInterface.php
+++ b/core/modules/block/custom_block/lib/Drupal/custom_block/CustomBlockTypeInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a custom block type entity.
  */
 interface CustomBlockTypeInterface extends ConfigEntityInterface {
 
diff --git a/core/modules/block/lib/Drupal/block/BlockInterface.php b/core/modules/block/lib/Drupal/block/BlockInterface.php
index cb57f56..cf049a5 100644
--- a/core/modules/block/lib/Drupal/block/BlockInterface.php
+++ b/core/modules/block/lib/Drupal/block/BlockInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a block entity.
  */
 interface BlockInterface extends ConfigEntityInterface {
 
diff --git a/core/modules/breakpoint/lib/Drupal/breakpoint/BreakpointGroupInterface.php b/core/modules/breakpoint/lib/Drupal/breakpoint/BreakpointGroupInterface.php
index e7e562a..3f441e9 100644
--- a/core/modules/breakpoint/lib/Drupal/breakpoint/BreakpointGroupInterface.php
+++ b/core/modules/breakpoint/lib/Drupal/breakpoint/BreakpointGroupInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a breakpoint group entity.
  */
 interface BreakpointGroupInterface extends ConfigEntityInterface {
 
diff --git a/core/modules/breakpoint/lib/Drupal/breakpoint/BreakpointInterface.php b/core/modules/breakpoint/lib/Drupal/breakpoint/BreakpointInterface.php
index 0c3935a..ccde947 100644
--- a/core/modules/breakpoint/lib/Drupal/breakpoint/BreakpointInterface.php
+++ b/core/modules/breakpoint/lib/Drupal/breakpoint/BreakpointInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a breakpoint entity.
  */
 interface BreakpointInterface extends ConfigEntityInterface {
 
diff --git a/core/modules/comment/lib/Drupal/comment/CommentInterface.php b/core/modules/comment/lib/Drupal/comment/CommentInterface.php
index 3aef0a1..c6bd7c7 100644
--- a/core/modules/comment/lib/Drupal/comment/CommentInterface.php
+++ b/core/modules/comment/lib/Drupal/comment/CommentInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Entity\ContentEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a comment entity.
  */
 interface CommentInterface extends ContentEntityInterface {
 
diff --git a/core/modules/contact/lib/Drupal/contact/CategoryInterface.php b/core/modules/contact/lib/Drupal/contact/CategoryInterface.php
index 5d99b0e..549b515 100644
--- a/core/modules/contact/lib/Drupal/contact/CategoryInterface.php
+++ b/core/modules/contact/lib/Drupal/contact/CategoryInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a contact category entity.
  */
 interface CategoryInterface extends ConfigEntityInterface {
 
diff --git a/core/modules/contact/lib/Drupal/contact/MessageInterface.php b/core/modules/contact/lib/Drupal/contact/MessageInterface.php
index ea58821..9e8879b 100644
--- a/core/modules/contact/lib/Drupal/contact/MessageInterface.php
+++ b/core/modules/contact/lib/Drupal/contact/MessageInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Entity\EntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a contant message entity
  */
 interface MessageInterface extends EntityInterface {
 
diff --git a/core/modules/editor/lib/Drupal/editor/EditorInterface.php b/core/modules/editor/lib/Drupal/editor/EditorInterface.php
index 330b7f2..de69488 100644
--- a/core/modules/editor/lib/Drupal/editor/EditorInterface.php
+++ b/core/modules/editor/lib/Drupal/editor/EditorInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a editor entity.
  */
 interface EditorInterface extends ConfigEntityInterface {
 
diff --git a/core/modules/entity/lib/Drupal/entity/EntityDisplayInterface.php b/core/modules/entity/lib/Drupal/entity/EntityDisplayInterface.php
index 253f3fe..0c1fa6c 100644
--- a/core/modules/entity/lib/Drupal/entity/EntityDisplayInterface.php
+++ b/core/modules/entity/lib/Drupal/entity/EntityDisplayInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining an entity display entity.
  */
 interface EntityDisplayInterface extends ConfigEntityInterface {
 
diff --git a/core/modules/field/lib/Drupal/field/FieldInstanceInterface.php b/core/modules/field/lib/Drupal/field/FieldInstanceInterface.php
index 9812eec..438bd00 100644
--- a/core/modules/field/lib/Drupal/field/FieldInstanceInterface.php
+++ b/core/modules/field/lib/Drupal/field/FieldInstanceInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a field instance entity.
  */
 interface FieldInstanceInterface extends ConfigEntityInterface, \ArrayAccess, \Serializable {
 
diff --git a/core/modules/field/lib/Drupal/field/FieldInterface.php b/core/modules/field/lib/Drupal/field/FieldInterface.php
index edb0f55..32673ff 100644
--- a/core/modules/field/lib/Drupal/field/FieldInterface.php
+++ b/core/modules/field/lib/Drupal/field/FieldInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a field entity.
  */
 interface FieldInterface extends ConfigEntityInterface, \ArrayAccess, \Serializable {
 
diff --git a/core/modules/file/lib/Drupal/file/FileInterface.php b/core/modules/file/lib/Drupal/file/FileInterface.php
index b391ed5..5912491 100644
--- a/core/modules/file/lib/Drupal/file/FileInterface.php
+++ b/core/modules/file/lib/Drupal/file/FileInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Entity\ContentEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a file entity.
  */
 interface FileInterface extends ContentEntityInterface {
 
diff --git a/core/modules/filter/lib/Drupal/filter/FilterFormatInterface.php b/core/modules/filter/lib/Drupal/filter/FilterFormatInterface.php
index 9a92921..001fa0a 100644
--- a/core/modules/filter/lib/Drupal/filter/FilterFormatInterface.php
+++ b/core/modules/filter/lib/Drupal/filter/FilterFormatInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a filter format entity.
  */
 interface FilterFormatInterface extends ConfigEntityInterface {
 
diff --git a/core/modules/image/lib/Drupal/image/ImageStyleInterface.php b/core/modules/image/lib/Drupal/image/ImageStyleInterface.php
index 64d3705..87367d3 100644
--- a/core/modules/image/lib/Drupal/image/ImageStyleInterface.php
+++ b/core/modules/image/lib/Drupal/image/ImageStyleInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining an image style entity.
  */
 interface ImageStyleInterface extends ConfigEntityInterface {
 
diff --git a/core/modules/menu_link/lib/Drupal/menu_link/MenuLinkInterface.php b/core/modules/menu_link/lib/Drupal/menu_link/MenuLinkInterface.php
index fd6432e..3d74bde 100644
--- a/core/modules/menu_link/lib/Drupal/menu_link/MenuLinkInterface.php
+++ b/core/modules/menu_link/lib/Drupal/menu_link/MenuLinkInterface.php
@@ -11,7 +11,7 @@
 use Drupal\Core\Entity\ContentEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a menu link entity.
  */
 interface MenuLinkInterface extends ContentEntityInterface {
 
diff --git a/core/modules/node/lib/Drupal/node/NodeInterface.php b/core/modules/node/lib/Drupal/node/NodeInterface.php
index 4445038..7999675 100644
--- a/core/modules/node/lib/Drupal/node/NodeInterface.php
+++ b/core/modules/node/lib/Drupal/node/NodeInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Entity\ContentEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a node entity.
  */
 interface NodeInterface extends ContentEntityInterface {
 
diff --git a/core/modules/picture/lib/Drupal/picture/PictureMappingInterface.php b/core/modules/picture/lib/Drupal/picture/PictureMappingInterface.php
index 10a631a..7ebf2d4 100644
--- a/core/modules/picture/lib/Drupal/picture/PictureMappingInterface.php
+++ b/core/modules/picture/lib/Drupal/picture/PictureMappingInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a picture mapping entity.
  */
 interface PictureMappingInterface extends ConfigEntityInterface {
 
diff --git a/core/modules/shortcut/lib/Drupal/shortcut/ShortcutInterface.php b/core/modules/shortcut/lib/Drupal/shortcut/ShortcutInterface.php
index a8d0697..97b999a 100644
--- a/core/modules/shortcut/lib/Drupal/shortcut/ShortcutInterface.php
+++ b/core/modules/shortcut/lib/Drupal/shortcut/ShortcutInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a shortcut entity.
  */
 interface ShortcutInterface extends ConfigEntityInterface {
 
diff --git a/core/modules/system/lib/Drupal/system/MenuInterface.php b/core/modules/system/lib/Drupal/system/MenuInterface.php
index ed6738c..11eca2c 100644
--- a/core/modules/system/lib/Drupal/system/MenuInterface.php
+++ b/core/modules/system/lib/Drupal/system/MenuInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a menu entity.
  */
 interface MenuInterface extends ConfigEntityInterface {
 
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/TermInterface.php b/core/modules/taxonomy/lib/Drupal/taxonomy/TermInterface.php
index a0a4484..20169e8 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/TermInterface.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/TermInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Entity\ContentEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a taxonomy term entity.
  */
 interface TermInterface extends ContentEntityInterface {
 
diff --git a/core/modules/taxonomy/lib/Drupal/taxonomy/VocabularyInterface.php b/core/modules/taxonomy/lib/Drupal/taxonomy/VocabularyInterface.php
index 528e02d..51ec34f 100644
--- a/core/modules/taxonomy/lib/Drupal/taxonomy/VocabularyInterface.php
+++ b/core/modules/taxonomy/lib/Drupal/taxonomy/VocabularyInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a taxonomy vocabulary entity.
  */
 interface VocabularyInterface extends ConfigEntityInterface {
 
diff --git a/core/modules/tour/lib/Drupal/tour/TourInterface.php b/core/modules/tour/lib/Drupal/tour/TourInterface.php
index 0b3d710..4678a7b 100644
--- a/core/modules/tour/lib/Drupal/tour/TourInterface.php
+++ b/core/modules/tour/lib/Drupal/tour/TourInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a tour entity.
  */
 interface TourInterface extends ConfigEntityInterface {
 
diff --git a/core/modules/user/lib/Drupal/user/RoleInterface.php b/core/modules/user/lib/Drupal/user/RoleInterface.php
index 3224ab5..f503ecc 100644
--- a/core/modules/user/lib/Drupal/user/RoleInterface.php
+++ b/core/modules/user/lib/Drupal/user/RoleInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Config\Entity\ConfigEntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a user role entity.
  */
 interface RoleInterface extends ConfigEntityInterface {
 
diff --git a/core/modules/user/lib/Drupal/user/UserInterface.php b/core/modules/user/lib/Drupal/user/UserInterface.php
index 98de086..99818a8 100644
--- a/core/modules/user/lib/Drupal/user/UserInterface.php
+++ b/core/modules/user/lib/Drupal/user/UserInterface.php
@@ -10,7 +10,7 @@
 use Drupal\Core\Entity\EntityInterface;
 
 /**
- * @todo.
+ * Provides an interface defining a user entity.
  */
 interface UserInterface extends EntityInterface {