diff --git a/configs/tools-only_defconfig b/configs/tools-only_defconfig
index 2197063112..3ad90835b7 100644
--- a/configs/tools-only_defconfig
+++ b/configs/tools-only_defconfig
@@ -3,6 +3,7 @@ CONFIG_SYS_MALLOC_LEN=0x2000000
 CONFIG_ENV_SIZE=0x2000
 CONFIG_DEFAULT_DEVICE_TREE="sandbox"
 CONFIG_SYS_LOAD_ADDR=0x0
+# CONFIG_SANDBOX_SDL is not set
 CONFIG_ANDROID_BOOT_IMAGE=y
 CONFIG_FIT=y
 CONFIG_TIMESTAMP=y