diff --git a/src/interfaces/adapter.php b/src/interfaces/adapter.php
index 2039b5c..f6069a9 100644
--- a/src/interfaces/adapter.php
+++ b/src/interfaces/adapter.php
@@ -14,6 +14,13 @@
  */
 interface Adapter {
 
+	/**
+	 * Fetches the date of the last modification to the last batch of videos.
+	 *
+	 * @return ?DateTimeImmutable
+	 */
+	public function get_last_modified_date(): ?DateTimeImmutable;
+
 	/**
 	 * Fetches videos from the provider that were modified after the provided DateTime.
 	 *