diff --git a/vcs/src/main/java/one/nem/lacerta/vcs/LacertaVcs.java b/vcs/src/main/java/one/nem/lacerta/vcs/LacertaVcs.java
index 664c45e1..20b3c6bd 100644
--- a/vcs/src/main/java/one/nem/lacerta/vcs/LacertaVcs.java
+++ b/vcs/src/main/java/one/nem/lacerta/vcs/LacertaVcs.java
@@ -3,7 +3,10 @@ package one.nem.lacerta.vcs;
 import java.util.ArrayList;
 import java.util.concurrent.CompletableFuture;
 
+import one.nem.lacerta.model.VcsLogModel;
 import one.nem.lacerta.model.VcsRevModel;
+import one.nem.lacerta.model.document.DocumentDetail;
+import one.nem.lacerta.source.database.entity.VcsLogEntity;
 
 public interface LacertaVcs {
 
@@ -20,6 +23,10 @@ public interface LacertaVcs {
 
     public CompletableFuture<ArrayList<VcsRevModel>> getRevisionHistory();
 
+    public CompletableFuture<ArrayList<VcsLogModel>> getLogHistory();
+
+    public CompletableFuture<ArrayList<DocumentDetail>> getDocumentDetailAtRev(String revId);
+
 
     // debug
     public void printLog();
diff --git a/vcs/src/main/java/one/nem/lacerta/vcs/impl/LacertaVcsImpl.java b/vcs/src/main/java/one/nem/lacerta/vcs/impl/LacertaVcsImpl.java
index 93d701d2..6779df46 100644
--- a/vcs/src/main/java/one/nem/lacerta/vcs/impl/LacertaVcsImpl.java
+++ b/vcs/src/main/java/one/nem/lacerta/vcs/impl/LacertaVcsImpl.java
@@ -10,7 +10,9 @@ import javax.inject.Inject;
 
 import dagger.assisted.Assisted;
 import dagger.assisted.AssistedInject;
+import one.nem.lacerta.model.VcsLogModel;
 import one.nem.lacerta.model.VcsRevModel;
+import one.nem.lacerta.model.document.DocumentDetail;
 import one.nem.lacerta.source.database.LacertaDatabase;
 import one.nem.lacerta.source.database.entity.VcsLogEntity;
 import one.nem.lacerta.source.database.entity.VcsRevEntity;
@@ -147,6 +149,16 @@ public class LacertaVcsImpl implements LacertaVcs {
         });
     }
 
+    @Override
+    public CompletableFuture<ArrayList<VcsLogModel>> getLogHistory() {
+        return null;
+    }
+
+    @Override
+    public CompletableFuture<ArrayList<DocumentDetail>> getDocumentDetailAtRev(String revId) {
+        return null;
+    }
+
     @Override
     public void printLog() {
         logger.debug(TAG, "printLog");