diff --git a/code/DynamoDbClient.php b/code/DynamoDbClient.php
index de4a84a..5bd343f 100644
--- a/code/DynamoDbClient.php
+++ b/code/DynamoDbClient.php
@@ -11,6 +11,8 @@
  * PHP string is the php binary data type, so this should work seamlessly.
  *
  * @see https://github.com/silverstripe/silverstripe-dynamodb/issues/32
+ *
+ * @internal WARNING: this is not a part of the public API and will be removed in a patch release
  */
 class DynamoDbClient extends \Aws\DynamoDb\DynamoDbClient
 {
diff --git a/code/SessionHandler.php b/code/SessionHandler.php
index a40b5ba..6a789d4 100644
--- a/code/SessionHandler.php
+++ b/code/SessionHandler.php
@@ -12,6 +12,8 @@
  * so the latter may intercept session table updates intelligently.
  *
  * @see \SilverStripe\DynamoDb\DynamoDbClient
+ *
+ * @internal WARNING: this is not a part of the public API and will be removed in a patch release
  */
 class SessionHandler extends \Aws\DynamoDb\SessionHandler
 {