diff --git a/drivers/media/platform/vsp1/vsp1_sru.c b/drivers/media/platform/vsp1/vsp1_sru.c
index 9919bebf4c54..b1617cb1f2b9 100644
--- a/drivers/media/platform/vsp1/vsp1_sru.c
+++ b/drivers/media/platform/vsp1/vsp1_sru.c
@@ -312,6 +312,11 @@ static unsigned int sru_max_width(struct vsp1_entity *entity,
 	output = vsp1_entity_get_pad_format(&sru->entity, sru->entity.config,
 					    SRU_PAD_SOURCE);
 
+	/*
+	 * The maximum input width of the SRU is 288 input pixels, but 32
+	 * pixels are reserved to support overlapping partition windows when
+	 * scaling.
+	 */
 	if (input->width != output->width)
 		return 512;
 	else