diff --git a/examples/discover/mcu.go b/examples/discover/mcu.go
index ffde2f44..5f1730cd 100644
--- a/examples/discover/mcu.go
+++ b/examples/discover/mcu.go
@@ -6,11 +6,15 @@ import (
 	"time"
 )
 
-// replace this with the MAC address of the Bluetooth peripheral you want to connect to.
-const deviceAddress = "E4:B7:F4:11:8D:33"
+// DeviceAddress is the MAC address of the Bluetooth peripheral you want to connect to.
+// Replace this by using -ldflags="-X main.DeviceAddress=[MAC ADDRESS]"
+// where [MAC ADDRESS] is the actual MAC address of the peripheral.
+// For example:
+// tinygo flash -target circuitplay-bluefruit -ldflags="-X main.DeviceAddress=7B:36:98:8C:41:1C" ./examples/discover/
+var DeviceAddress string
 
 func connectAddress() string {
-	return deviceAddress
+	return DeviceAddress
 }
 
 // wait on baremetal, proceed immediately on desktop OS.
diff --git a/examples/heartrate-monitor/mcu.go b/examples/heartrate-monitor/mcu.go
index 3527bde0..456a98f1 100644
--- a/examples/heartrate-monitor/mcu.go
+++ b/examples/heartrate-monitor/mcu.go
@@ -6,11 +6,15 @@ import (
 	"time"
 )
 
-// replace this with the MAC address of the Bluetooth peripheral you want to connect to.
-const deviceAddress = "E4:B7:F4:11:8D:33"
+// DeviceAddress is the MAC address of the Bluetooth peripheral you want to connect to.
+// Replace this by using -ldflags="-X main.DeviceAddress=[MAC ADDRESS]"
+// where [MAC ADDRESS] is the actual MAC address of the peripheral.
+// For example:
+// tinygo flash -target circuitplay-bluefruit -ldflags="-X main.DeviceAddress=7B:36:98:8C:41:1C" ./examples/heartrate-monitor/
+var DeviceAddress string
 
 func connectAddress() string {
-	return deviceAddress
+	return DeviceAddress
 }
 
 // done just blocks forever, allows USB CDC reset for flashing new software.