diff --git a/src/AppLegacy.php b/src/AppLegacy.php
index 4aa3f25e4c..8ec6b0aabc 100644
--- a/src/AppLegacy.php
+++ b/src/AppLegacy.php
@@ -32,6 +32,7 @@ use Friendica\Util\Strings;
  * and anything else that might need to be passed around
  * before we spit the page out.
  *
+ * @internal
  */
 final class AppLegacy implements AppHelper
 {
diff --git a/src/Core/Container.php b/src/Core/Container.php
index 1017590a85..55e0826122 100644
--- a/src/Core/Container.php
+++ b/src/Core/Container.php
@@ -11,6 +11,8 @@ namespace Friendica\Core;
 
 /**
  * Dependency Injection Container
+ *
+ * @internal
  */
 interface Container
 {
diff --git a/src/Core/DiceContainer.php b/src/Core/DiceContainer.php
index 304c1e411d..bd1eaf8043 100644
--- a/src/Core/DiceContainer.php
+++ b/src/Core/DiceContainer.php
@@ -13,6 +13,8 @@ use Dice\Dice;
 
 /**
  * Wrapper for the Dice class to make some basic setups
+ *
+ * @internal
  */
 final class DiceContainer implements Container
 {
diff --git a/src/Core/Logger/Factory/LegacyLoggerFactory.php b/src/Core/Logger/Factory/LegacyLoggerFactory.php
index 5c91d11771..2c7b6c0237 100644
--- a/src/Core/Logger/Factory/LegacyLoggerFactory.php
+++ b/src/Core/Logger/Factory/LegacyLoggerFactory.php
@@ -26,6 +26,8 @@ use Psr\Log\LoggerInterface;
  *
  * @see \Friendica\Core\Logger\Factory\StreamLogger
  * @see \Friendica\Core\Logger\Factory\SyslogLogger
+ *
+ * @internal
  */
 final class LegacyLoggerFactory implements LoggerFactory
 {
diff --git a/src/Core/Logger/LoggerManager.php b/src/Core/Logger/LoggerManager.php
index 697756099d..8379c91995 100644
--- a/src/Core/Logger/LoggerManager.php
+++ b/src/Core/Logger/LoggerManager.php
@@ -21,6 +21,8 @@ use Psr\Log\NullLogger;
 
 /**
  * Manager for the core logging instances
+ *
+ * @internal
  */
 final class LoggerManager
 {