diff --git a/proprietary-files.txt b/proprietary-files.txt
index 998aabe..dd81fb3 100644
--- a/proprietary-files.txt
+++ b/proprietary-files.txt
@@ -1,3 +1,5 @@
+# Device proprietary files - from UL-ASUS_X01BD-WW-17.2018.2004.424-user build, unless pinned
+
 # Audio ACDB
 vendor/etc/acdbdata/adsp_avs_config.acdb
 vendor/etc/acdbdata/QRD/QRD_Hdmi_cal.acdb