diff --git a/backend.proto b/backend.proto
index a54a947..93fceab 100644
--- a/backend.proto
+++ b/backend.proto
@@ -27,7 +27,9 @@ message BackendLEDOptions {
 }
 
 message BackendSetChannel {
-    map <int32, double> new_channel_values = 2;
+    map <int32, double> values = 1;
+    map <int32, float> correction = 2;
+
 }
 
 message BackendWrapperMessage {
diff --git a/client.proto b/client.proto
index 8097079..95d8f9f 100644
--- a/client.proto
+++ b/client.proto
@@ -17,6 +17,7 @@ message AddLED {
     string name = 1;
     string backend = 2;
     repeated int32 channel = 3;
+    repeated float correction = 4;
 }
 
 message RemoveLED {