diff --git a/include/functions b/include/functions
index 928f8042..80ff366b 100644
--- a/include/functions
+++ b/include/functions
@@ -607,6 +607,8 @@
                 # Try common guest processes
                 logtext "Test: trying to guess virtual machine type by sysctl keys"
 
+                # NetBSD: machdep.dmi.system-product
+                # OpenBSD: hw.product
                 FIND=`sysctl -a | egrep "(hw.product|machdep.dmi.system-product)" | sed 's/ = /=/' | awk -F= '{ print $2 }'`
                 if [ ! "${FIND}" = "" ]; then
                     case ${FIND} in