Index: libexec/rc/rc.d/devmatch
===================================================================
--- libexec/rc/rc.d/devmatch
+++ libexec/rc/rc.d/devmatch
@@ -64,7 +64,7 @@
 	# names with .ko
 
 	devctl freeze
-	x=$(echo '#'${devmatch_blocklist:-${devmatch_blacklist}}'#' | \
+	x=$(echo "#${devmatch_blocklist:-${devmatch_blacklist}}#$(kenv -q devmatch_blocklist)#" | \
 		sed -e "s/ /#/g;s/\.ko#/#/g")
 	for m in ${list}; do
 		m="${m%.ko}"
Index: sbin/devmatch/devmatch.8
===================================================================
--- sbin/devmatch/devmatch.8
+++ sbin/devmatch/devmatch.8
@@ -23,7 +23,7 @@
 .\"
 .\" $FreeBSD$
 .\"
-.Dd October 12, 2020
+.Dd September 28, 2021
 .Dt DEVMATCH 8
 .Os
 .Sh NAME
@@ -66,6 +66,17 @@
 .It Fl v Fl -verbose
 Produce more verbose output.
 .El
+.Pp
+The
+.Xr rc.conf 5
+.Va devmatch_blocklist
+variable is used to block specific modules from being loaded.
+In addition, the
+.Xr rc.d 8
+scripts will add modules listed in the
+.Va devmatch_blocklist
+.Xr kenv 1
+variable.
 .Sh SEE ALSO
 .Xr devinfo 8 ,
 .Xr MODULE_PNP_INFO 9