diff --git a/libs/core/battery.ts b/libs/core/battery.ts
index 36a06733..dc26f5fb 100644
--- a/libs/core/battery.ts
+++ b/libs/core/battery.ts
@@ -1,6 +1,6 @@
 
 const enum BatteryProperty {
-    //% level (%)
+    //% block="level (%)"
     Level,
     //% block="current (I)"
     Current,