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 fbf200a1..29125361 100644
--- a/vcs/src/main/java/one/nem/lacerta/vcs/LacertaVcs.java
+++ b/vcs/src/main/java/one/nem/lacerta/vcs/LacertaVcs.java
@@ -1,4 +1,15 @@
 package one.nem.lacerta.vcs;
 
 public interface LacertaVcs {
+
+    // Actions
+    public void updatePage(int index, String fileName);
+
+    public void insertPage(int index, String fileName);
+
+    public void deletePage(int index);
+
+    // debug
+    public void printLog();
+
 }