diff --git a/src/db/db/dbNetlistSpiceWriter.cc b/src/db/db/dbNetlistSpiceWriter.cc
index 171945acd..3cc5cd92d 100644
--- a/src/db/db/dbNetlistSpiceWriter.cc
+++ b/src/db/db/dbNetlistSpiceWriter.cc
@@ -249,6 +249,7 @@ void NetlistSpiceWriterDelegate::write_device_profile (const db::Device &dev, co
   }
 
   if (! direct_value.is_nil ()) {
+    os << " ";
     write_parameter_value (os, direct_value, 1.0);
   }
 
diff --git a/src/db/db/gsiDeclDbNetlistDeviceClass.cc b/src/db/db/gsiDeclDbNetlistDeviceClass.cc
index a05d40236..e3229f001 100644
--- a/src/db/db/gsiDeclDbNetlistDeviceClass.cc
+++ b/src/db/db/gsiDeclDbNetlistDeviceClass.cc
@@ -350,6 +350,19 @@ Class<db::DeviceClass::SpiceProfile> decl_dbDeviceClassSpiceProfile ("db", "Devi
     "The terminal order is a list of terminal names that specifies which device terminal to tie to the "
     "nets given in the SPICE statement. The list items must be strings corresponding to valid terminal "
     "names of the device."
+    "\n"
+    "Note, that the terminal order attribute is a copy. In order to manipulate it, you need "
+    "to change the copy and put it back again:\n"
+    "\n"
+    "@code\n"
+    "# adds a new terminal 'B' to the terminal order of the default SPICE profile of a device class:\n"
+    "cls = ... # some device class\n"
+    "sp = cls.spice_profile('')\n"
+    "term = sp.terminal_order\n"
+    "term.append('B')\n"
+    "sp.terminal_order = term\n"
+    "cls.set_spice_profile('', sp)\n"
+    "@/code\n"
   ) +
   gsi::method_ext ("terminal_order=", &set_terminal_order,
     "@brief Sets the terminal order to use for this device.\n"
@@ -391,6 +404,19 @@ Class<db::DeviceClass::SpiceProfile> decl_dbDeviceClassSpiceProfile ("db", "Devi
     "device or the default value is used if the parameter is a declared one.\n"
     "An empty expression string is equal to \"nil\", so you can drop a parameter\n"
     "by mapping the name to an empty string, e.g. '\"M\": \"\"' (drops \"M\").\n"
+    "\n"
+    "Note, that the incoming parameter hash is a copy. In order to manipulate it, you "
+    "need get and set it:\n"
+    "\n"
+    "@code\n"
+    "# adds a new incoming parameter called 'P' to a device classes default SPICE profile:\n"
+    "cls = ... # some device class\n"
+    "sp = cls.spice_profile('')\n"
+    "par = sp.incoming_parameters\n"
+    "par['P'] = 'P*2.0'\n"
+    "sp.incoming_parameters = par\n"
+    "cls.set_spice_profile('', sp)\n"
+    "@/code\n"
   ) +
   gsi::method_ext ("incoming_parameters=", &set_incoming_parameters,
     "@brief Sets the mapping of incoming parameters from SPICE files\n"
@@ -419,6 +445,16 @@ Class<db::DeviceClass::SpiceProfile> decl_dbDeviceClassSpiceProfile ("db", "Devi
     "how the value of the parameter is computed from device parameters.\n"
     "\"_\" is the value of the same SPICE parameter. This is useful for generating\n"
     "catch-all rules, such as '\"*\": \"_\"' (copy all parameters).\n"
+    "\n"
+    "@code\n"
+    "# adds a new outgoing parameter called 'P' to a device classes default SPICE profile:\n"
+    "cls = ... # some device class\n"
+    "sp = cls.spice_profile('')\n"
+    "par = sp.outgoing_parameters\n"
+    "par['P'] = 'P*2.0'\n"
+    "sp.outgoing_parameters = par\n"
+    "cls.set_spice_profile('', sp)\n"
+    "@/code\n"
   ) +
   gsi::method_ext ("outgoing_parameters=", &set_outgoing_parameters,
     "@brief Sets the mapping tables for outgoing parameters\n"
diff --git a/src/lvs/unit_tests/lvsSimpleTests.cc b/src/lvs/unit_tests/lvsSimpleTests.cc
index e248cee48..ae092428e 100644
--- a/src/lvs/unit_tests/lvsSimpleTests.cc
+++ b/src/lvs/unit_tests/lvsSimpleTests.cc
@@ -247,6 +247,7 @@ TEST(25_blackbox)
 TEST(26_enableWandL)
 {
   run_test (_this, "enable_wl1", "resistor.gds");
+  run_test (_this, "enable_wl1b", "resistor.gds");
   run_test (_this, "enable_wl2", "resistor.gds");
   run_test (_this, "enable_wl3", "resistor.gds");
 }
diff --git a/testdata/lvs/enable_wl1b.cir b/testdata/lvs/enable_wl1b.cir
new file mode 100644
index 000000000..d668c488e
--- /dev/null
+++ b/testdata/lvs/enable_wl1b.cir
@@ -0,0 +1,11 @@
+* Extracted by KLayout
+
+* cell Rre
+* pin gnd!
+* pin vdd!
+.SUBCKT Rre 1 2
+* net 1 gnd!
+* net 2 vdd!
+* device instance $1 r0 *1 8.43,1.51 RR1
+R$1 1 2 10 RR1 L=6U W=0.6U
+.ENDS Rre
diff --git a/testdata/lvs/enable_wl1b.lvs b/testdata/lvs/enable_wl1b.lvs
new file mode 100644
index 000000000..c46f98fb6
--- /dev/null
+++ b/testdata/lvs/enable_wl1b.lvs
@@ -0,0 +1,36 @@
+
+source($lvs_test_source)
+report_lvs($lvs_test_target_lvsdb, true)
+target_netlist($lvs_test_target_cir, write_spice, "Extracted by KLayout")
+
+schematic("resistor.cir")
+
+deep
+
+contact     = input(15, 0)
+metal1      = input(16, 0)  
+metal1_ver  = input(16, 5)
+metal1_lbl  = labels(16, 3) 
+res = metal1 & metal1_ver
+metal1_not_res = metal1 - metal1_ver
+
+dc = extract_devices(resistor("RR1", 1),  { "R" => res , "C" => metal1_not_res})
+dc.enable_parameter("W", true)
+dc.enable_parameter("L", true)
+sp = dc.spice_profile("")
+sp.outgoing_parameters = {
+  "R" => "",  # drop
+  "W" => "W",
+  "L" => "L",
+  "$" => "R"  # direct value
+}
+dc.set_spice_profile("", sp)
+
+connect(contact, metal1_not_res)
+connect(metal1_not_res, metal1_lbl)
+
+align
+netlist.make_top_level_pins(false)
+netlist.simplify
+compare
+
diff --git a/testdata/lvs/enable_wl1b.lvsdb b/testdata/lvs/enable_wl1b.lvsdb
new file mode 100644
index 000000000..67695b612
--- /dev/null
+++ b/testdata/lvs/enable_wl1b.lvsdb
@@ -0,0 +1,118 @@
+#%lvsdb-klayout
+
+# Layout
+layout(
+ top(Rre)
+ unit(0.001)
+
+ # Layer section
+ # This section lists the mask layers (drawing or derived) and their connections.
+
+ # Mask layers
+ layer(l3 '15/0')
+ layer(l4 '16/3')
+ layer(l1)
+
+ # Mask layer connectivity
+ connect(l3 l3 l1)
+ connect(l4 l1)
+ connect(l1 l3 l4 l1)
+
+ # Device class section
+ class(RR1 RES
+  param(L 1 0)
+  param(W 1 0)
+ )
+
+ # Device abstracts section
+ # Device abstracts list the pin shapes of the devices.
+ device(D$RR1 RR1
+  terminal(A
+   rect(l1 (-3160 -300) (160 600))
+  )
+  terminal(B
+   rect(l1 (3000 -300) (160 600))
+  )
+ )
+
+ # Circuit section
+ # Circuits are the hierarchical building blocks of the netlist.
+ circuit(Rre
+
+  # Circuit boundary
+  rect((5270 1210) (6320 600))
+
+  # Nets with their geometries
+  net(1 name('gnd!')
+   rect(l3 (5295 1230) (120 560))
+   text(l4 'gnd!' (-60 -60))
+   rect(l1 (-70 -505) (125 570))
+   rect(l1 (-140 -585) (160 600))
+  )
+  net(2 name('vdd!')
+   rect(l3 (11455 1240) (120 540))
+   text(l4 'vdd!' (-65 -60))
+   rect(l1 (-65 -495) (125 560))
+   rect(l1 (-140 -575) (160 600))
+  )
+
+  # Outgoing pins and their connections to nets
+  pin(1 name('gnd!'))
+  pin(2 name('vdd!'))
+
+  # Devices and their connections
+  device(1 D$RR1
+   location(8430 1510)
+   param(R 10)
+   param(L 6)
+   param(W 0.6)
+   param(A 3.6)
+   param(P 13.2)
+   terminal(A 1)
+   terminal(B 2)
+  )
+
+ )
+)
+
+# Reference netlist
+reference(
+
+ # Device class section
+ class(RR1 RES)
+
+ # Circuit section
+ # Circuits are the hierarchical building blocks of the netlist.
+ circuit(RRE
+
+  # Nets
+  net(1 name('VDD!'))
+  net(2 name('GND!'))
+
+  # Devices and their connections
+  device(1 RR1
+   name(R0)
+   param(R 10)
+   param(L 6)
+   param(W 0.6)
+   param(A 0)
+   param(P 0)
+   terminal(A 1)
+   terminal(B 2)
+  )
+
+ )
+)
+
+# Cross reference
+xref(
+ circuit(Rre RRE match
+  xref(
+   net(1 2 match)
+   net(2 1 match)
+   pin(0 () match)
+   pin(1 () match)
+   device(1 1 match)
+  )
+ )
+)