diff --git a/util/ectool/ec.h b/util/ectool/ec.h
index b06816d..7400778 100644
--- a/util/ectool/ec.h
+++ b/util/ectool/ec.h
@@ -47,4 +47,5 @@
 uint8_t recv_ec_data(void);
 uint8_t ec_read(uint8_t addr);
 
+uint8_t ec_idx_read(uint16_t addr);
 #endif