diff --git a/docs/en/api/power.md b/docs/en/api/power.md
index 1b9ea243..32be9a1b 100644
--- a/docs/en/api/power.md
+++ b/docs/en/api/power.md
@@ -388,7 +388,7 @@ No argument.
 
 **Syntax:**
 
-<mark>bool getBatteryLevel()</mark>
+<mark>int8_t getBatteryLevel()</mark>
 
 **Description:**