diff --git a/smartmontools/ChangeLog b/smartmontools/ChangeLog
index c5f10c7e..b4c58d27 100644
--- a/smartmontools/ChangeLog
+++ b/smartmontools/ChangeLog
@@ -1,5 +1,10 @@
 $Id$
 
+2022-01-14  Alex Samorukov   <samm@os2.kiev.ua>
+
+	drivedb.h: Add xerrorlba flag to the  WD Caviar Black (#1558) family
+	smartd.service: add comment about virtualisation
+
 2022-01-09  Douglas Gilbert  <dgilbert@interlog.com>
 
 	scsiprint.cpp, scsicmds.h/.cpp: do some preliminary
diff --git a/smartmontools/drivedb.h b/smartmontools/drivedb.h
index 6adf4ecc..88a02348 100644
--- a/smartmontools/drivedb.h
+++ b/smartmontools/drivedb.h
@@ -4787,7 +4787,7 @@ const drive_settings builtin_knowndrives[] = {
     "WDC WD((500|640)1AAL|7501AA[EL]|1001FA[EL]|2001FAS)S-.*|"
     "WDC WD(2002|7502|1502|5003|1002|5002)(FAE|AAE|AZE|AAL)X-.*", // could be
     // WD2002FAEX, WD7502AAEX, WD1502FAEX, WD5003AZEX, WD1002FAEX, WD5002AALX
-    "", "", ""
+    "", "", "-F xerrorlba" // WDC WD6401AALS-00L3B2/01.03B01 (ticket #1558)
   },
   { "Western Digital Black", // tested with
       // WDC WD1003FZEX-00MK2A0/01.01A01, WDC WD3001FAEX-00MJRA0/01.01L01,
diff --git a/smartmontools/smartd.service.in b/smartmontools/smartd.service.in
index 2b7dfaf4..cf66054c 100644
--- a/smartmontools/smartd.service.in
+++ b/smartmontools/smartd.service.in
@@ -1,6 +1,9 @@
 [Unit]
 Description=Self Monitoring and Reporting Technology (SMART) Daemon
 Documentation=man:smartd(8) man:smartd.conf(5)
+
+# Typically physical storage devices are managed by the host physical machine
+# Override it if you are using PCI/USB passthrough
 ConditionVirtualization=no
 
 [Service]