diff --git a/api/nodes/optical_stimulation.proto b/api/nodes/optical_stimulation.proto
index dcbfa6a..d0bef87 100644
--- a/api/nodes/optical_stimulation.proto
+++ b/api/nodes/optical_stimulation.proto
@@ -2,6 +2,11 @@ syntax = "proto3";
 
 package synapse;
 
+message DisplayMap {
+  repeated uint32 row_map = 1;
+  repeated uint32 col_map = 2;
+}
+
 message OpticalStimulationConfig {
   uint32 peripheral_id = 1;
   repeated uint32 pixel_mask = 2;
@@ -9,9 +14,11 @@ message OpticalStimulationConfig {
   uint32 frame_rate = 4;
   float gain = 5;
 
-  // Instruct the FPGA to send out a 1xN vector 
+  // Instruct the FPGA to send out a 1xN vector
   // where N is the number of LEDs with each Axon frame
   bool send_receipts = 6;
+
+  DisplayMap display_map = 7;
 }
 
 // Core frame type for LED array optical stimulation