diff --git a/Liebert/Liebert__PSI5__usbhid-ups__2.8.2.1__01.dev b/Liebert/Liebert__PSI5__usbhid-ups__2.8.2.1__01.dev
new file mode 100644
index 0000000..8b0f63d
--- /dev/null
+++ b/Liebert/Liebert__PSI5__usbhid-ups__2.8.2.1__01.dev
@@ -0,0 +1,87 @@
+# Please add if relevant: DEVICE:URL:REPORT: <GitHub issue/PR or Mailing list archive entry URL>
+# DEVICE:URL:VENDOR: https://www.vertiv.com/en-us/products-catalog/critical-power/uninterruptible-power-supplies-ups/psi5-800rt120/
+
+# Please add comments for humans here and perhaps raise concerns about the data points,
+# see https://networkupstools.org/ddl/#devseq-files for comment-tag syntax
+# strip sensitive data (passwords, SNMP community, serial number, IP address, host name...)
+# and post as a pull request to https://github.com/networkupstools/nut-ddl/
+
+# DEVICE:COMMENT-BLOCK:UPSCONF:
+# > There is a temprature sensor inside this UPS but its not reported here
+# [UPS]
+#      driver = "usbhid-ups"
+#      port = "auto"
+#      vendorid = "10AF"
+#      productid = "0002"
+#      product = "Liebert PSI5"
+#      vendor = "Vertiv Co."
+#      ### These are the most important parameters
+#      ### Otherwise the UPS reports OB and no Battery %
+#      usb_hid_rep_index = 1
+#      usb_hid_desc_index = 1
+#      pollonly = 1
+#      ### Optional:
+#      # bus = "001"
+#      # device = "002"
+#      # busport = "001"
+# DEVICE:EOC
+
+# :; upsc UPS
+battery.capacity: 800
+battery.charge: 100
+battery.charge.warning: 20
+battery.runtime: 12600
+battery.type: PbAc
+battery.voltage: 27.3
+battery.voltage.nominal: 24
+device.mfr: Vertiv Co.
+device.model: Liebert PSI5
+device.serial: [REDACTED]
+device.type: ups
+driver.debug: 0
+driver.flag.allow_killpower: 0
+driver.name: usbhid-ups
+driver.parameter.pollfreq: 30
+driver.parameter.pollinterval: 2
+driver.parameter.port: auto
+driver.parameter.product: Liebert PSI5
+driver.parameter.productid: 0002
+driver.parameter.serial: [REDACTED]
+driver.parameter.synchronous: auto
+driver.parameter.usb_hid_desc_index: 1
+driver.parameter.usb_hid_rep_index: 1
+driver.parameter.pollonly: 1	#COMMENT: If it is not set, the driver may crash or have some odd error
+driver.parameter.vendor: Vertiv Co.
+driver.parameter.vendorid: 10AF
+driver.state: quiet
+driver.version: 2.8.2.1
+driver.version.data: Belkin/Liebert HID 0.21
+driver.version.internal: 0.54
+driver.version.usb: libusb-1.0.28 (API: 0x100010a)
+input.frequency: 60.0
+input.voltage: 121.4
+input.voltage.nominal: 120
+output.frequency: 60.0
+output.voltage: 121.5
+output.voltage.nominal: 120
+ups.load: 6
+ups.mfr: Vertiv Co.
+ups.model: Liebert PSI5
+ups.productid: 0002
+ups.serial: [REDACTED]
+ups.status: OL CHRG
+ups.vendorid: 10af
+
+# DEVICE:COMMENT-BLOCK:FIXME:UPSRW: UPS
+# [driver.debug]
+# Current debug verbosity level of the driver program
+# Type: NUMBER
+# Value: 0
+#
+# [driver.flag.allow_killpower]
+# Safety flip-switch to allow the driver daemon to send UPS shutdown command (accessible via driver.killpower) 
+# This is NOT tested, Use at your own Risk
+# Type: NUMBER
+# Value: 0
+# DEVICE:EOC
+
diff --git a/Makefile b/Makefile
index 516cb33..4621979 100644
--- a/Makefile
+++ b/Makefile
@@ -40,23 +40,25 @@ check-content-markup:
 	find . -type f -name '*.dev' | ( \
 		echo "`date -u`: Sanity-checking the *.dev files..." >&2 ; \
 		if [ -x $(NUT_WEBSITE_DIR)/tools/nut-ddl.py ] ; then \
-			echo "`date -u`: will use $(NUT_DDL_PYTHON) $(NUT_WEBSITE_DIR)/tools/nut-ddl.py for deeper checks" >&2 ; \
+			echo "`date -u`: Will use $(NUT_DDL_PYTHON) $(NUT_WEBSITE_DIR)/tools/nut-ddl.py for deeper checks" >&2 ; \
 		fi ; \
 		FAILED=""; \
 		PASSED=""; \
+		WORSTRES=0; \
 		while read F ; do \
 			if [ -x $(NUT_WEBSITE_DIR)/tools/nut-ddl.py ] ; then \
 				RES=0 ; $(NUT_DDL_PYTHON) $(NUT_WEBSITE_DIR)/tools/nut-ddl.py "$$F" "$$F.tmp.html" </dev/null >&2 || RES=$$? ; \
 				rm -f "$$F.tmp.html" ; \
 				if [ "$$RES" != 0 ] ; then \
+					WORSTRES=$$RES; \
 					echo "^^^ $$F" >&2 && FAILED="$$FAILED $$F" && continue; \
 				fi ; \
 			fi ; \
-			egrep -v '^( *\#.*|.*:.*)$$' "$$F" | egrep -v '^$$' >&2 && echo "^^^ $$F" >&2 && FAILED="$$FAILED $$F" && continue; \
+			egrep -v '^( *\#.*|.*:.*)$$' "$$F" | egrep -v '^$$' >&2 && echo "^^^ $$F" >&2 && FAILED="$$FAILED $$F" && WORSTRES=2 && continue; \
 			PASSED="$$PASSED $$F"; \
 		done; \
-		if [ -n "$$FAILED" ]; then echo "`date -u`: FAILED sanity-check (got RES=$$RES) in following file(s) : $$FAILED" >&2; exit 1; fi; \
-		if [ x"$$RES" != x0 ]; then echo "`date -u`: FAILED sanity-check : got RES=$$RES" >&2; exit $$RES; fi; \
+		if [ -n "$$FAILED" ]; then echo "`date -u`: FAILED sanity-check (got WORSTRES=$$WORSTRES) in following file(s) : $$FAILED" >&2; exit 1; fi; \
+		if [ x"$$WORSTRES" != x0 ]; then echo "`date -u`: FAILED sanity-check : got WORSTRES=$$WORSTRES" >&2; exit $$RES; fi; \
 		echo "`date -u`: OK : All *.dev files have passed the basic sanity check : $$PASSED"; \
 		exit 0; \
 	)