diff --git a/Shorewall/firewall b/Shorewall/firewall
index c885f6640..ca7d13e21 100755
--- a/Shorewall/firewall
+++ b/Shorewall/firewall
@@ -1265,6 +1265,8 @@ setup_providers()
     add_a_provider() {
 	local t n iface option
 
+	[ -n "$MANGLE_ENABLED" ] || fatal_error "Providers require mangle support in your kernel and iptables"
+
 	for t in $PROVIDERS; do
 	    if [ "$t" = "$table" ]; then
 		fatal_error "Duplicate Provider: $table, provider: \"$provider\""
diff --git a/Shorewall/tcrules b/Shorewall/tcrules
index f77486c85..bee5bb571 100755
--- a/Shorewall/tcrules
+++ b/Shorewall/tcrules
@@ -48,10 +48,10 @@
 #				CP: Mark the connection in the PREROUTING
 #				    chain.
 #
-#			b) A classification of the form <major>:<minor> where
-#			   <major> and <minor> are integers. Corresponds to
-#			   the 'class' specification in these traffic shaping
-#			   modules:
+#			b) A classification (classid) of the form
+#                          <major>:<minor> where <major> and <minor> are
+#                          integers. Corresponds to the 'class' specification
+#                          in these traffic shaping modules:
 #
 #				- atm
 #				- cbq