diff --git a/core/lib/Drupal/Core/Database/Driver/mysql/Connection.php b/core/lib/Drupal/Core/Database/Driver/mysql/Connection.php
index c48c275..9e281c4 100644
--- a/core/lib/Drupal/Core/Database/Driver/mysql/Connection.php
+++ b/core/lib/Drupal/Core/Database/Driver/mysql/Connection.php
@@ -21,6 +21,9 @@
  * @{
  */
 
+/**
+ * Implements the DatabaseConnetion for the MySQL database driver.
+ */
 class Connection extends DatabaseConnection {
 
   /**
diff --git a/core/lib/Drupal/Core/Database/Driver/mysql/Delete.php b/core/lib/Drupal/Core/Database/Driver/mysql/Delete.php
index 4e594da..95545f8 100644
--- a/core/lib/Drupal/Core/Database/Driver/mysql/Delete.php
+++ b/core/lib/Drupal/Core/Database/Driver/mysql/Delete.php
@@ -9,4 +9,7 @@
 
 use Drupal\Core\Database\Query\Delete as QueryDelete;
 
+/**
+ * Implements the Delete query for the MySQL database driver.
+ */
 class Delete extends QueryDelete { }
diff --git a/core/lib/Drupal/Core/Database/Driver/mysql/Insert.php b/core/lib/Drupal/Core/Database/Driver/mysql/Insert.php
index b458d36..29acee8 100644
--- a/core/lib/Drupal/Core/Database/Driver/mysql/Insert.php
+++ b/core/lib/Drupal/Core/Database/Driver/mysql/Insert.php
@@ -9,6 +9,9 @@
 
 use Drupal\Core\Database\Query\Insert as QueryInsert;
 
+/**
+ * Implements the Insert query for the MySQL database driver.
+ */
 class Insert extends QueryInsert {
 
   public function execute() {
diff --git a/core/lib/Drupal/Core/Database/Driver/mysql/Merge.php b/core/lib/Drupal/Core/Database/Driver/mysql/Merge.php
index b98d868..ea2f118 100644
--- a/core/lib/Drupal/Core/Database/Driver/mysql/Merge.php
+++ b/core/lib/Drupal/Core/Database/Driver/mysql/Merge.php
@@ -9,4 +9,7 @@
 
 use Drupal\Core\Database\Query\Merge as QueryMerge;
 
+/**
+ * Implements the Merge query for the MySQL database driver.
+ */
 class Merge extends QueryMerge { }
diff --git a/core/lib/Drupal/Core/Database/Driver/mysql/Schema.php b/core/lib/Drupal/Core/Database/Driver/mysql/Schema.php
index a20e58d..d3c7c80 100644
--- a/core/lib/Drupal/Core/Database/Driver/mysql/Schema.php
+++ b/core/lib/Drupal/Core/Database/Driver/mysql/Schema.php
@@ -19,6 +19,9 @@
  * @{
  */
 
+/**
+ * Implements the database Schema for the MySQL database driver.
+ */
 class Schema extends DatabaseSchema {
 
   /**
diff --git a/core/lib/Drupal/Core/Database/Driver/mysql/Select.php b/core/lib/Drupal/Core/Database/Driver/mysql/Select.php
index caa2dbf..eade508 100644
--- a/core/lib/Drupal/Core/Database/Driver/mysql/Select.php
+++ b/core/lib/Drupal/Core/Database/Driver/mysql/Select.php
@@ -9,4 +9,7 @@
 
 use Drupal\Core\Database\Query\Select as QuerySelect;
 
+/**
+ * Implements the Select query for the MySQL database driver.
+ */
 class Select extends QuerySelect { }
diff --git a/core/lib/Drupal/Core/Database/Driver/mysql/Transaction.php b/core/lib/Drupal/Core/Database/Driver/mysql/Transaction.php
index a04d7a0..e8b92a5 100644
--- a/core/lib/Drupal/Core/Database/Driver/mysql/Transaction.php
+++ b/core/lib/Drupal/Core/Database/Driver/mysql/Transaction.php
@@ -9,4 +9,7 @@
 
 use Drupal\Core\Database\Transaction as DatabaseTransaction;
 
+/**
+ * Implements the database Transaction for the MySQL database driver.
+ */
 class Transaction extends DatabaseTransaction { }
diff --git a/core/lib/Drupal/Core/Database/Driver/mysql/Truncate.php b/core/lib/Drupal/Core/Database/Driver/mysql/Truncate.php
index 00cf10c..1d2cc30 100644
--- a/core/lib/Drupal/Core/Database/Driver/mysql/Truncate.php
+++ b/core/lib/Drupal/Core/Database/Driver/mysql/Truncate.php
@@ -9,4 +9,7 @@
 
 use Drupal\Core\Database\Query\Truncate as QueryTruncate;
 
+/**
+ * Implements the Truncate query for the MySQL database driver.
+ */
 class Truncate extends QueryTruncate { }
diff --git a/core/lib/Drupal/Core/Database/Driver/mysql/Update.php b/core/lib/Drupal/Core/Database/Driver/mysql/Update.php
index 7d96e55..abf034e 100644
--- a/core/lib/Drupal/Core/Database/Driver/mysql/Update.php
+++ b/core/lib/Drupal/Core/Database/Driver/mysql/Update.php
@@ -9,4 +9,7 @@
 
 use Drupal\Core\Database\Query\Update as QueryUpdate;
 
+/**
+ * Implements the Query query for the MySQL database driver.
+ */
 class Update extends QueryUpdate { }
diff --git a/core/lib/Drupal/Core/Database/Driver/pgsql/Connection.php b/core/lib/Drupal/Core/Database/Driver/pgsql/Connection.php
index b5ef45d..bed6476 100644
--- a/core/lib/Drupal/Core/Database/Driver/pgsql/Connection.php
+++ b/core/lib/Drupal/Core/Database/Driver/pgsql/Connection.php
@@ -16,6 +16,9 @@
  * @{
  */
 
+/**
+ * Implements the database Connection for the PostgreSQL database driver.
+ */
 class Connection extends DatabaseConnection {
 
   /**
diff --git a/core/lib/Drupal/Core/Database/Driver/pgsql/Delete.php b/core/lib/Drupal/Core/Database/Driver/pgsql/Delete.php
index f8940ad..d338581 100644
--- a/core/lib/Drupal/Core/Database/Driver/pgsql/Delete.php
+++ b/core/lib/Drupal/Core/Database/Driver/pgsql/Delete.php
@@ -9,6 +9,9 @@
 
 use Drupal\Core\Database\Query\Delete as QueryDelete;
 
+/**
+ * Implements the Delete query for the PostgreSQL database driver.
+ */
 class Delete extends QueryDelete {
 
   /**
diff --git a/core/lib/Drupal/Core/Database/Driver/pgsql/Insert.php b/core/lib/Drupal/Core/Database/Driver/pgsql/Insert.php
index f36f509..f394f79 100644
--- a/core/lib/Drupal/Core/Database/Driver/pgsql/Insert.php
+++ b/core/lib/Drupal/Core/Database/Driver/pgsql/Insert.php
@@ -15,6 +15,9 @@
  * @{
  */
 
+/**
+ * Implements the Insert query for the PostgreSQL database driver.
+ */
 class Insert extends QueryInsert {
 
   public function execute() {
diff --git a/core/lib/Drupal/Core/Database/Driver/pgsql/Merge.php b/core/lib/Drupal/Core/Database/Driver/pgsql/Merge.php
index ad74c13..706ce52 100644
--- a/core/lib/Drupal/Core/Database/Driver/pgsql/Merge.php
+++ b/core/lib/Drupal/Core/Database/Driver/pgsql/Merge.php
@@ -9,4 +9,7 @@
 
 use Drupal\Core\Database\Query\Merge as QueryMerge;
 
+/**
+ * Implements the Merge query for the PostgreSQL database driver.
+ */
 class Merge extends QueryMerge { }
diff --git a/core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php b/core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php
index cd22b94..9825e74 100644
--- a/core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php
+++ b/core/lib/Drupal/Core/Database/Driver/pgsql/Schema.php
@@ -17,6 +17,9 @@
  * @{
  */
 
+/**
+ * Implements the database Schema for the PostgreSQL database driver.
+ */
 class Schema extends DatabaseSchema {
 
   /**
diff --git a/core/lib/Drupal/Core/Database/Driver/pgsql/Select.php b/core/lib/Drupal/Core/Database/Driver/pgsql/Select.php
index 0b58c67..54ad9f9 100644
--- a/core/lib/Drupal/Core/Database/Driver/pgsql/Select.php
+++ b/core/lib/Drupal/Core/Database/Driver/pgsql/Select.php
@@ -14,6 +14,9 @@
  * @{
  */
 
+/**
+ * Implements the Select query for the PostgreSQL database driver.
+ */
 class Select extends QuerySelect {
 
   public function orderRandom() {
diff --git a/core/lib/Drupal/Core/Database/Driver/pgsql/Transaction.php b/core/lib/Drupal/Core/Database/Driver/pgsql/Transaction.php
index 682c53c..de8b8eb 100644
--- a/core/lib/Drupal/Core/Database/Driver/pgsql/Transaction.php
+++ b/core/lib/Drupal/Core/Database/Driver/pgsql/Transaction.php
@@ -9,4 +9,7 @@
 
 use Drupal\Core\Database\Transaction as DatabaseTransaction;
 
+/**
+ * Implements the Transaction query for the PostgreSQL database driver.
+ */
 class Transaction extends DatabaseTransaction { }
diff --git a/core/lib/Drupal/Core/Database/Driver/pgsql/Truncate.php b/core/lib/Drupal/Core/Database/Driver/pgsql/Truncate.php
index c0ad989..7fad730 100644
--- a/core/lib/Drupal/Core/Database/Driver/pgsql/Truncate.php
+++ b/core/lib/Drupal/Core/Database/Driver/pgsql/Truncate.php
@@ -9,6 +9,9 @@
 
 use Drupal\Core\Database\Query\Truncate as QueryTruncate;
 
+/**
+ * Implements the Truncate query for the PostgreSQL database driver.
+ */
 class Truncate extends QueryTruncate {
 
   /**
diff --git a/core/lib/Drupal/Core/Database/Driver/pgsql/Update.php b/core/lib/Drupal/Core/Database/Driver/pgsql/Update.php
index 5d4171d..08018c6 100644
--- a/core/lib/Drupal/Core/Database/Driver/pgsql/Update.php
+++ b/core/lib/Drupal/Core/Database/Driver/pgsql/Update.php
@@ -11,6 +11,9 @@
 use Drupal\Core\Database\Query\Update as QueryUpdate;
 use Drupal\Core\Database\Query\SelectInterface;
 
+/**
+ * Implements the Update query for the PostgreSQL database driver.
+ */
 class Update extends QueryUpdate {
 
   public function execute() {
diff --git a/core/lib/Drupal/Core/Database/Driver/sqlite/Merge.php b/core/lib/Drupal/Core/Database/Driver/sqlite/Merge.php
index 2acea07..0a7c9ba 100644
--- a/core/lib/Drupal/Core/Database/Driver/sqlite/Merge.php
+++ b/core/lib/Drupal/Core/Database/Driver/sqlite/Merge.php
@@ -9,4 +9,7 @@
 
 use Drupal\Core\Database\Query\Merge as QueryMerge;
 
+/**
+ * SQLite implementation of \Drupal\Core\Database\Query\Merge.
+ */
 class Merge extends QueryMerge { }
diff --git a/core/lib/Drupal/Core/Database/Driver/sqlite/Schema.php b/core/lib/Drupal/Core/Database/Driver/sqlite/Schema.php
index 6799dcb..b3c2d2a 100644
--- a/core/lib/Drupal/Core/Database/Driver/sqlite/Schema.php
+++ b/core/lib/Drupal/Core/Database/Driver/sqlite/Schema.php
@@ -17,6 +17,9 @@
  * @{
  */
 
+/**
+ * SQLite implementation of \Drupal\Core\Database\Schema.
+ */
 class Schema extends DatabaseSchema {
 
   /**
diff --git a/core/lib/Drupal/Core/Database/Driver/sqlite/Select.php b/core/lib/Drupal/Core/Database/Driver/sqlite/Select.php
index 8f2fdb7..52cb291 100644
--- a/core/lib/Drupal/Core/Database/Driver/sqlite/Select.php
+++ b/core/lib/Drupal/Core/Database/Driver/sqlite/Select.php
@@ -9,6 +9,9 @@
 
 use Drupal\Core\Database\Query\Select as QuerySelect;
 
+/**
+ * SQLite implementation of \Drupal\Core\Database\Query\Select.
+ */
 class Select extends QuerySelect {
   public function forUpdate($set = TRUE) {
     // SQLite does not support FOR UPDATE so nothing to do.
diff --git a/core/lib/Drupal/Core/Database/Driver/sqlite/Transaction.php b/core/lib/Drupal/Core/Database/Driver/sqlite/Transaction.php
index 736dbcc..ac0c209 100644
--- a/core/lib/Drupal/Core/Database/Driver/sqlite/Transaction.php
+++ b/core/lib/Drupal/Core/Database/Driver/sqlite/Transaction.php
@@ -9,4 +9,7 @@
 
 use Drupal\Core\Database\Transaction as DatabaseTransaction;
 
+/**
+ * SQLite implementation of \Drupal\Core\Database\Transaction.
+ */
 class Transaction extends DatabaseTransaction { }
diff --git a/core/lib/Drupal/Core/Database/Driver/sqlite/Update.php b/core/lib/Drupal/Core/Database/Driver/sqlite/Update.php
index aca3c95..fe409e0 100644
--- a/core/lib/Drupal/Core/Database/Driver/sqlite/Update.php
+++ b/core/lib/Drupal/Core/Database/Driver/sqlite/Update.php
@@ -9,4 +9,7 @@
 
 use Drupal\Core\Database\Query\Update as QueryUpdate;
 
+/**
+ * SQLite implementation of \Drupal\Core\Database\Query\Update.
+ */
 class Update extends QueryUpdate { }