diff --git a/source/src/main/java/one/nem/lacerta/source/file/factory/FileManagerFactory.java b/source/src/main/java/one/nem/lacerta/source/file/factory/FileManagerFactory.java
new file mode 100644
index 00000000..c4617e85
--- /dev/null
+++ b/source/src/main/java/one/nem/lacerta/source/file/factory/FileManagerFactory.java
@@ -0,0 +1,11 @@
+package one.nem.lacerta.source.file.factory;
+
+import java.nio.file.Path;
+
+import dagger.assisted.AssistedFactory;
+import one.nem.lacerta.source.file.FileManager;
+
+@AssistedFactory
+public interface FileManagerFactory {
+    FileManager create(Path rootDir);
+}