diff --git a/src/db/db/gsiDeclDbNetlistDeviceClasses.cc b/src/db/db/gsiDeclDbNetlistDeviceClasses.cc
index 934ef9590..58cb7f6ab 100644
--- a/src/db/db/gsiDeclDbNetlistDeviceClasses.cc
+++ b/src/db/db/gsiDeclDbNetlistDeviceClasses.cc
@@ -134,14 +134,16 @@ Class<db::DeviceClassDiode> decl_dbDeviceClassDiode (decl_dbDeviceClass, "db", "
   ) +
   gsi::constant ("PARAM_A", db::DeviceClassDiode::param_id_A,
     "@brief A constant giving the parameter ID for parameter A"
+  ) +
+  gsi::constant ("PARAM_P", db::DeviceClassDiode::param_id_P,
+    "@brief A constant giving the parameter ID for parameter P"
   ),
   "@brief A device class for a diode.\n"
-  "This class descibes a diode. Diodes are defined by their combination behavior and "
-  "the basic parameter 'A' which is their area in square micrometers.\n"
+  "This class descibes a diode.\n"
+  "A diode has two terminals, A (anode) and C (cathode).\n"
+  "It has two parameters: The diode area in square micrometers (A) and the diode area perimeter in micrometers (P).\n"
   "\n"
-  "Diodes only combine when parallel and in the same direction. In this case, their areas are added."
-  "\n"
-  "An inductor has two terminals, A (anode) and C (cathode).\n"
+  "Diodes only combine when parallel and in the same direction. In this case, their areas and perimeters are added."
   "\n"
   "This class has been introduced in version 0.26."
 );
diff --git a/testdata/ruby/dbNetlistDeviceClasses.rb b/testdata/ruby/dbNetlistDeviceClasses.rb
index 702c30ee5..fda223a36 100644
--- a/testdata/ruby/dbNetlistDeviceClasses.rb
+++ b/testdata/ruby/dbNetlistDeviceClasses.rb
@@ -181,8 +181,10 @@ END
 
     d1 = circuit.create_device(cls, "d1")
     d1.set_parameter(RBA::DeviceClassDiode::PARAM_A, 1.0)
+    d1.set_parameter(RBA::DeviceClassDiode::PARAM_P, 2.0)
     d2 = circuit.create_device(cls, "d2")
     d2.set_parameter("A", 3.0)
+    d2.set_parameter("P", 4.0)
 
     pin_a = circuit.create_pin ("A")
     pin_b = circuit.create_pin ("B")
@@ -199,8 +201,8 @@ END
 
     assert_equal(nl.to_s, <<END)
 circuit '' (A=n1,B=n2);
-  device '' d1 (A=n1,C=n2) (A=1);
-  device '' d2 (A=n1,C=n2) (A=3);
+  device '' d1 (A=n1,C=n2) (A=1,P=2);
+  device '' d2 (A=n1,C=n2) (A=3,P=4);
 end;
 END
 
@@ -209,7 +211,7 @@ END
 
     assert_equal(nl.to_s, <<END)
 circuit '' (A=n1,B=n2);
-  device '' d1 (A=n1,C=n2) (A=4);
+  device '' d1 (A=n1,C=n2) (A=4,P=6);
 end;
 END