diff --git a/lib/linux/constants.rb b/lib/linux/constants.rb
index 0e777c5..bc8fa21 100644
--- a/lib/linux/constants.rb
+++ b/lib/linux/constants.rb
@@ -43,7 +43,7 @@ module Linux
   NLM_F_CREATE		= 0x400
   NLM_F_APPEND		= 0x800
 
-  NLMSG_ALIGNTO		= 4
+  NLMSG_ALIGNTO		= 4	# same on i686 and x86_64
   
   NLMSG_NOOP		= 0x1
   NLMSG_ERROR		= 0x2
@@ -63,7 +63,7 @@ module Linux
   NLA_F_NET_BYTEORDER		= (1 << 14)
   NLA_TYPE_MASK			= ~(NLA_F_NESTED | NLA_F_NET_BYTEORDER)
   
-  NLA_ALIGNTO			= 4
+  NLA_ALIGNTO			= 4	# same on i686 and x86_64
   
   # from linux/rtnetlink.h.
   RTM_NEWLINK		= 16
diff --git a/test/t_route.rb b/test/t_route.rb
index 4196762..2786215 100644
--- a/test/t_route.rb
+++ b/test/t_route.rb
@@ -72,6 +72,10 @@ class TestAddr < Test::Unit::TestCase
       @ip.vlan.list(:link=>"lo").map { |x| x.linkinfo.data.id }
     end
   
+    # FIXME: On 10.04.2 LTS (32 and 64 bit) this gives Errno::EOPNOTSUPP; but
+    #    ip link add link lo type vlan id 1234
+    #    ip link delete vlan0
+    # both work fine.
     test "Add and remove vlan" do
       begin
         @ip.vlan.delete(:link=>"lo", :vlan_id=>1234)