diff --git a/source/src/main/java/one/nem/lacerta/source/file/FileManager.java b/source/src/main/java/one/nem/lacerta/source/file/FileManager.java
index cad34d3b..f996e781 100644
--- a/source/src/main/java/one/nem/lacerta/source/file/FileManager.java
+++ b/source/src/main/java/one/nem/lacerta/source/file/FileManager.java
@@ -6,6 +6,7 @@ import org.w3c.dom.Document;
 
 import java.io.File;
 import java.io.IOException;
+import java.lang.reflect.Field;
 import java.nio.file.Path;
 import java.util.List;
 
@@ -35,6 +36,8 @@ public interface FileManager {
     FileManager createFile(String fileName) throws IOException;
     FileManager createDirectory() throws IOException;
     FileManager createDirectory(String directoryName) throws IOException;
+    FileManager createDirectoryIfNotExist() throws IOException;
+    FileManager createDirectoryIfNotExist(String directoryName) throws IOException;
 
     // Save
     // XML
diff --git a/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java b/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
index 21987841..71826eb2 100644
--- a/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
+++ b/source/src/main/java/one/nem/lacerta/source/file/impl/FileManagerImpl.java
@@ -203,6 +203,16 @@ public class FileManagerImpl implements FileManager {
         return this.createDirectory();
     }
 
+    @Override
+    public FileManager createDirectoryIfNotExist() throws IOException {
+        return null;
+    }
+
+    @Override
+    public FileManager createDirectoryIfNotExist(String directoryName) throws IOException {
+        return null;
+    }
+
     // Internal
     private void saveXmlInternal(Document document) throws IOException {
         try {