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 dcc21e52..14f83970 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
@@ -29,6 +29,9 @@ public interface FileManager {
     String loadText(String fileName);
     String loadText(Path path);
 
+    void saveText(String text, String fileName);
+    void saveText(String text, Path path);
+
     boolean isExist(Path path);
     boolean isExist(String fileName);
 
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 92a4af70..2173d35b 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
@@ -151,7 +151,7 @@ public class FileManagerImpl implements FileManager {
     }
 
     @Override
-    public String loadText(String fileName) {
+    public String loadText(String fileName) { // TODO-rca: 統合
         try(FileInputStream fileInputStream = new FileInputStream(currentDir.resolve(fileName).toFile())) {
             byte[] bytes = new byte[fileInputStream.available()];
             fileInputStream.read(bytes); // TODO-rca: エラーハンドリング
@@ -174,6 +174,17 @@ public class FileManagerImpl implements FileManager {
         }
     }
 
+    @Override
+    public void saveText(String text, String fileName) {
+        createFile(fileName);
+
+    }
+
+    @Override
+    public void saveText(String text, Path path) {
+
+    }
+
     @Override
     public boolean isExist(Path path) {
         logger.debug("isExist", "called");