diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/makibeshr3/MakibesHR3Constants.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/makibeshr3/MakibesHR3Constants.java
index d3e925515..8bf50f86f 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/makibeshr3/MakibesHR3Constants.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/devices/makibeshr3/MakibesHR3Constants.java
@@ -86,6 +86,11 @@ public final class MakibesHR3Constants {
     public static final byte RPRT_REVERSE_FIND_DEVICE = (byte) 0x7d;
 
 
+    // The proximity sensor sees air..
+    public static final byte ARG_HEARTRATE_NO_TARGET = (byte) 0xff;
+    // The hr sensor didn't find the heart rate yet.
+    public static final byte ARG_HEARTRATE_NO_READING = (byte) 0x00;
+
     // heart rate
     public static final byte RPRT_HEARTRATE = (byte) 0x84;
 
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/makibeshr3/MakibesHR3DeviceSupport.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/makibeshr3/MakibesHR3DeviceSupport.java
index fcd8c0bd7..0cccbfab0 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/makibeshr3/MakibesHR3DeviceSupport.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/makibeshr3/MakibesHR3DeviceSupport.java
@@ -2,6 +2,8 @@
 
 // TODO: Battery level
 
+// TODO: Step target
+
 // TODO: It'd be cool if we could change the language. There's no official way to do so, but the
 // TODO: watch is sold as chinese/english.