diff --git a/app/src/main/java/org/ntlab/acanthus_client/resources/HelloWorldRest.java b/app/src/main/java/org/ntlab/acanthus_client/resources/HelloWorldRest.java
new file mode 100644
index 0000000..ab532b0
--- /dev/null
+++ b/app/src/main/java/org/ntlab/acanthus_client/resources/HelloWorldRest.java
@@ -0,0 +1,10 @@
+package org.ntlab.acanthus_client.resources;
+
+import okhttp3.ResponseBody;
+import retrofit2.Call;
+import retrofit2.http.GET;
+
+public interface HelloWorldRest {
+    @GET("hello_world")
+    public Call<String> getHelloWorld();
+}