diff --git a/CHANGELOG.md b/CHANGELOG.md
index 0ccf6c6..435bfbe 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -1,3 +1,7 @@
+## [1.5.1]
+
+* Add `lastSyncCompletedDate` getter.
+
 ## [1.5.0+1]
 
 * Added deprecated `SyncError.updateLinksExeption` for compatibility with previous data from db.
diff --git a/lib/src/sync_repository.dart b/lib/src/sync_repository.dart
index 6cd9538..3d07738 100644
--- a/lib/src/sync_repository.dart
+++ b/lib/src/sync_repository.dart
@@ -63,5 +63,17 @@ abstract class SyncRepository {
   Stream<SyncStateInfo> get state;
 
   /// Returns the date of the last synchronization with device time.
+  /// 
+  /// This is the most recent date when a chunk of data was received from the server.
+  /// It does not indicate whether a full sync occurred —
+  /// meaning both sending all local data and receiving all server data.
+  /// See [lastSyncCompletedDate] for the time of the last successful full sync.
   Future<DateTime?> get lastSyncDate;
+
+  /// Returns the date of the last successful synchronization complete
+  /// with device time.
+  ///
+  /// Synchronization is considered complete if there is nothing
+  /// to send to the server and nothing to take from it, including files.
+  Future<DateTime?> get lastSyncCompletedDate;
 }
diff --git a/pubspec.yaml b/pubspec.yaml
index 1a44954..2753f11 100644
--- a/pubspec.yaml
+++ b/pubspec.yaml
@@ -1,6 +1,6 @@
 name: in_sync_interface
 description: An interface for synchronization functional. Used by in_sync.
-version: 1.5.0+1
+version: 1.5.1
 homepage: https://github.com/innim/
 repository: https://github.com/Innim/in_sync_interface
 issue_tracker: https://github.com/Innim/in_sync_interface/issues