diff --git a/src/db/db/dbNetlistDeviceClasses.cc b/src/db/db/dbNetlistDeviceClasses.cc
index 57c9bd1f1..90993cadd 100644
--- a/src/db/db/dbNetlistDeviceClasses.cc
+++ b/src/db/db/dbNetlistDeviceClasses.cc
@@ -502,8 +502,9 @@ DeviceClassResistor::DeviceClassResistor ()
     { "M", "" },   //  drop
     //  apply scaling if available
     { "R", "(R||$)/M" },
+    { "L", "L*M" },
+    { "W", "W" },
     { "A", "A*M" },
-    { "W", "W*M" },
     { "P", "P*M" }
   };
 
diff --git a/src/db/db/dbNetlistSpiceWriter.cc b/src/db/db/dbNetlistSpiceWriter.cc
index f91c2c962..cb7eb95b8 100644
--- a/src/db/db/dbNetlistSpiceWriter.cc
+++ b/src/db/db/dbNetlistSpiceWriter.cc
@@ -99,7 +99,7 @@ void NetlistSpiceWriterDelegate::write_device (const db::Device &dev) const
   const db::DeviceClass *dc = dev.device_class ();
 
   const db::DeviceClass::SpiceProfile &profile = dc->spice_profile (mp_writer->profile ());
-  if (! profile.element.empty ()) {
+  if (! profile.outgoing_parameters.empty ()) {
     write_device_profile (dev, profile);
   } else {
     write_device_default (dev);
@@ -113,7 +113,6 @@ void NetlistSpiceWriterDelegate::write_device_profile (const db::Device &dev, co
   os << profile.element;
   os << format_name (dev.expanded_name ());
   os << format_terminals_with_order (dev, profile.terminal_order);
-  os << " ";
   if (! dev.device_class ()->name ().empty ()) {
     os << " ";
     os << format_name (dev.device_class ()->name ());
@@ -152,7 +151,7 @@ void NetlistSpiceWriterDelegate::write_device_default (const db::Device &dev) co
       os << format_name (dev.device_class ()->name ());
     }
 
-    os << format_params (dev, db::DeviceClassCapacitor::param_id_C);
+    os << format_params (dev, db::DeviceClassCapacitor::param_id_C, true);
 
   } else if (ind) {
 
@@ -165,7 +164,7 @@ void NetlistSpiceWriterDelegate::write_device_default (const db::Device &dev) co
       os << " ";
       os << format_name (dev.device_class ()->name ());
     }
-    os << format_params (dev, db::DeviceClassInductor::param_id_L);
+    os << format_params (dev, db::DeviceClassInductor::param_id_L, true);
 
   } else if (res || res3) {
 
@@ -178,7 +177,7 @@ void NetlistSpiceWriterDelegate::write_device_default (const db::Device &dev) co
       os << " ";
       os << format_name (dev.device_class ()->name ());
     }
-    os << format_params (dev, db::DeviceClassResistor::param_id_R);
+    os << format_params (dev, db::DeviceClassResistor::param_id_R, true);
 
   } else if (diode) {
 
@@ -270,9 +269,12 @@ std::string NetlistSpiceWriterDelegate::format_terminals_with_order (const db::D
   return os.str ();
 }
 
-std::string NetlistSpiceWriterDelegate::format_params (const db::Device &dev, size_t without_id) const
+std::string NetlistSpiceWriterDelegate::format_params (const db::Device &dev, size_t without_id, bool only_primary) const
 {
-  bool only_primary = ! m_write_all_parameters;
+  if (m_write_all_parameters) {
+    only_primary = false;
+  }
+
   std::ostringstream os;
 
   const std::vector<db::DeviceParameterDefinition> &pd = dev.device_class ()->parameter_definitions ();
diff --git a/src/db/db/dbNetlistSpiceWriter.h b/src/db/db/dbNetlistSpiceWriter.h
index 1577a9a18..03ccbbfbc 100644
--- a/src/db/db/dbNetlistSpiceWriter.h
+++ b/src/db/db/dbNetlistSpiceWriter.h
@@ -67,7 +67,7 @@ public:
   std::string format_name (const std::string &s) const;
   std::string format_terminals (const db::Device &dev, size_t max_terminals = std::numeric_limits<size_t>::max ()) const;
   std::string format_terminals_with_order (const db::Device &dev, const std::vector<std::string> &terminal_order) const;
-  std::string format_params (const db::Device &dev, size_t without_id = std::numeric_limits<size_t>::max ()) const;
+  std::string format_params (const db::Device &dev, size_t without_id = std::numeric_limits<size_t>::max (), bool only_primary = false) const;
 
 private:
   friend class NetlistSpiceWriter;
diff --git a/src/db/unit_tests/dbNetlistCompareTests.cc b/src/db/unit_tests/dbNetlistCompareTests.cc
index 49a64c93b..e2f31a414 100644
--- a/src/db/unit_tests/dbNetlistCompareTests.cc
+++ b/src/db/unit_tests/dbNetlistCompareTests.cc
@@ -4673,7 +4673,7 @@ TEST(26_JoinSymmetricNets)
   nl.combine_devices ();
   EXPECT_EQ (nl.to_string (),
     "circuit RESCUBE (A=A,B=B);\n"
-    "  device RES $10 (A=A,B=B) (R=833.333333333,L=0,W=0,A=0,P=0);\n"
+    "  device RES $10 (A=A,B=B) (R=833.333333333333,L=0,W=0,A=0,P=0);\n"
     "end;\n"
   )
 }
diff --git a/src/doc/doc/about/expressions.xml b/src/doc/doc/about/expressions.xml
index 4f350f1b0..5d0b21ec1 100644
--- a/src/doc/doc/about/expressions.xml
+++ b/src/doc/doc/about/expressions.xml
@@ -75,6 +75,39 @@ Box.new(-10, 0, 90, 60).width
   as "false" but as "true"!
   </p>
 
+  <p>
+  The "nil" value shortcuts numerical expressions the following way:
+  </p>
+
+  <pre>
+nil + x    -> nil
+x + nil    -> x
+nil + nil  -> nil
+</pre>
+
+  <p>
+  The same applies to the other binary operators "*", "/", "-", "&amp;" "|", "&lt;&lt; and "&gt;&gt;".
+  </p>
+
+  <p>
+  The unary operators "-" and "~" deliver "nil" when used with a "nil" argument.
+  </p>
+
+  <p>
+  The logical binary operators "||" and "&amp;&amp;" behave this way:
+  </p>
+
+  <pre>
+x || y      -> x if x is not "nil" or "false", y otherwise
+x || nil    -> x
+nil || x    -> x
+nil || nil  -> nil
+x &amp;&amp; y      -> y if x is not "nil" or "false", x otherwise
+x &amp;&amp; nil    -> nil
+nil &amp;&amp; x    -> nil
+nil &amp;&amp; nil  -> nil
+</pre>
+
   <h2>Constants</h2>
 
   <p>