diff --git a/src/ha.h b/src/ha.h
index d559d19..8ebbc6b 100644
--- a/src/ha.h
+++ b/src/ha.h
@@ -75,6 +75,7 @@ namespace Ha {
 
         const char* id = nullptr;
         const char* type = nullptr;
+        const char* entityId = nullptr;
 
         const char* name = nullptr;
         const char* entityCategory = nullptr;
@@ -111,6 +112,7 @@ namespace Ha {
     protected:
         void buildConfig(JsonDocument& jsonDoc) override {
             if (mainDevice) mainDevice->buildConfig(jsonDoc);
+            if (entityId) jsonDoc["object_id"] = entityId;
             if (entityCategory) jsonDoc["entity_category"] = entityCategory;
             if (deviceClass) jsonDoc["device_class"] = deviceClass;
             if (icon) jsonDoc["icon"] = icon;
@@ -404,6 +406,11 @@ namespace Ha {
             return *this;
         }
 
+        Builder& withEntityId(const char* value) {
+            cmp->entityId = value;
+            return *this;
+        }
+
         Builder& withUnitMeasure(const char* value) {
             cmp->unitMeasure = value;
             return *this;