diff --git a/app/src/main/java/org/ntlab/radishforandroidstudio/cactusClient/UseCases/UpdateBoundary.java b/app/src/main/java/org/ntlab/radishforandroidstudio/cactusClient/UseCases/UpdateBoundary.java
new file mode 100644
index 0000000..b73c2ec
--- /dev/null
+++ b/app/src/main/java/org/ntlab/radishforandroidstudio/cactusClient/UseCases/UpdateBoundary.java
@@ -0,0 +1,6 @@
+package org.ntlab.radishforandroidstudio.cactusClient.UseCases;
+
+public interface UpdateBoundary {
+
+    void onUpdate(long interval);
+}