diff --git a/plat/allwinner/common/sunxi_bl31_setup.c b/plat/allwinner/common/sunxi_bl31_setup.c
index 14049e8..ed3dbd4 100644
--- a/plat/allwinner/common/sunxi_bl31_setup.c
+++ b/plat/allwinner/common/sunxi_bl31_setup.c
@@ -180,6 +180,7 @@
 
 	sunxi_pmic_setup(soc_id, fdt);
 
+	/* Change the DTB if the configuration requires so. */
 	sunxi_prepare_dtb(fdt);
 
 	INFO("BL31: Platform setup done\n");