diff --git a/ethosu/vela/tflite_graph_optimiser.py b/ethosu/vela/tflite_graph_optimiser.py
index f3ca1b6..574d298 100644
--- a/ethosu/vela/tflite_graph_optimiser.py
+++ b/ethosu/vela/tflite_graph_optimiser.py
@@ -454,7 +454,9 @@
             # use depthwise conv to select the correct value
             scaled_op = convert_resizenn_ac_to_depthwise_conv(scaled_op, upscale_factor)
         else:
-            # keep 1x1 kernel and average pool
+            # Keep 1x1 kernel and average pool, this applies both when
+            # half-pixel-centers is True and False. Calculations are the
+            # same in the reference.
             pass
 
     scaled_op.outputs = outputs