diff --git a/UPGRADE.md b/UPGRADE.md
index e1611c2c..e16ded6e 100644
--- a/UPGRADE.md
+++ b/UPGRADE.md
@@ -6,6 +6,10 @@ awareness about deprecated code.
 - Use of our low-overhead runtime deprecation API, details:
   https://github.com/doctrine/deprecations/
 
+# Upgrade to 1.8
+
+Executor and Purger classes are now final. You should not extend them.
+
 # Upgrade to 1.6
 
 ## BC BREAK: `CircularReferenceException` no longer extends `Doctrine\Common\CommonException`
diff --git a/docs/en/explanation/transactions-and-purging.rst b/docs/en/explanation/transactions-and-purging.rst
index 8ccb6fab..d0f04ad4 100644
--- a/docs/en/explanation/transactions-and-purging.rst
+++ b/docs/en/explanation/transactions-and-purging.rst
@@ -1,9 +1,8 @@
 Transactions and purging
 ========================
 
-This package exposes an ``AbstractExecutor`` class and 3 concrete
-implementations for ``doctrine/orm``, ``doctrine/mongodb-odm`` and
-``doctrine/phpcr-odm``.
+This package provides executors for ``doctrine/orm``, ``doctrine/mongodb-odm``
+and ``doctrine/phpcr-odm``.
 
 The executors purge the database, then load the fixtures. The ORM
 implementation wraps these two steps in a database transaction, which
diff --git a/src/Executor/AbstractExecutor.php b/src/Executor/AbstractExecutor.php
index d0c31b3b..f1bcdd82 100644
--- a/src/Executor/AbstractExecutor.php
+++ b/src/Executor/AbstractExecutor.php
@@ -17,6 +17,8 @@
 
 /**
  * Abstract fixture executor.
+ *
+ * @internal since 1.8.0
  */
 abstract class AbstractExecutor
 {
diff --git a/src/Executor/MongoDBExecutor.php b/src/Executor/MongoDBExecutor.php
index ff2a72d1..c3d91424 100644
--- a/src/Executor/MongoDBExecutor.php
+++ b/src/Executor/MongoDBExecutor.php
@@ -11,6 +11,8 @@
 
 /**
  * Class responsible for executing data fixtures.
+ *
+ * @final since 1.8.0
  */
 class MongoDBExecutor extends AbstractExecutor
 {
diff --git a/src/Executor/ORMExecutor.php b/src/Executor/ORMExecutor.php
index a82a0a2a..1ce9014a 100644
--- a/src/Executor/ORMExecutor.php
+++ b/src/Executor/ORMExecutor.php
@@ -8,6 +8,8 @@
 
 /**
  * Class responsible for executing data fixtures.
+ *
+ * @final since 1.8.0
  */
 class ORMExecutor extends AbstractExecutor
 {
diff --git a/src/Executor/PHPCRExecutor.php b/src/Executor/PHPCRExecutor.php
index bd1fca70..dc62a35c 100644
--- a/src/Executor/PHPCRExecutor.php
+++ b/src/Executor/PHPCRExecutor.php
@@ -11,6 +11,8 @@
 
 /**
  * Class responsible for executing data fixtures.
+ *
+ * @final since 1.8.0
  */
 class PHPCRExecutor extends AbstractExecutor
 {
diff --git a/src/Purger/MongoDBPurger.php b/src/Purger/MongoDBPurger.php
index 3ac7c6f7..dfbc3767 100644
--- a/src/Purger/MongoDBPurger.php
+++ b/src/Purger/MongoDBPurger.php
@@ -8,6 +8,8 @@
 
 /**
  * Class responsible for purging databases of data before reloading data fixtures.
+ *
+ * @final since 1.8.0
  */
 class MongoDBPurger implements PurgerInterface
 {
diff --git a/src/Purger/ORMPurger.php b/src/Purger/ORMPurger.php
index 2fbf4095..ba820377 100644
--- a/src/Purger/ORMPurger.php
+++ b/src/Purger/ORMPurger.php
@@ -19,6 +19,8 @@
 
 /**
  * Class responsible for purging databases of data before reloading data fixtures.
+ *
+ * @final since 1.8.0
  */
 class ORMPurger implements PurgerInterface, ORMPurgerInterface
 {
diff --git a/src/Purger/PHPCRPurger.php b/src/Purger/PHPCRPurger.php
index eba6c317..01da74ef 100644
--- a/src/Purger/PHPCRPurger.php
+++ b/src/Purger/PHPCRPurger.php
@@ -10,6 +10,8 @@
 
 /**
  * Class responsible for purging databases of data before reloading data fixtures.
+ *
+ * @final since 1.8.0
  */
 class PHPCRPurger implements PurgerInterface
 {