diff --git a/src/src/main/java/com/my/graphiteDigesterBg/diframe/actuator/DiActHeater.java b/src/src/main/java/com/my/graphiteDigesterBg/diframe/actuator/DiActHeater.java
index f7b6942..354eaf2 100644
--- a/src/src/main/java/com/my/graphiteDigesterBg/diframe/actuator/DiActHeater.java
+++ b/src/src/main/java/com/my/graphiteDigesterBg/diframe/actuator/DiActHeater.java
@@ -1,5 +1,6 @@
 package com.my.graphiteDigesterBg.diframe.actuator;
-public interface DiActHeater {
+import com.my.graphiteDigesterBg.diframe.DiActuator;
+public interface DiActHeater extends DiActuator {
     // set temperature
     void setTemperature( Integer temperature );