diff --git a/readme.md b/readme.md
index 7cc8375..45f2743 100644
--- a/readme.md
+++ b/readme.md
@@ -2,7 +2,7 @@
 
 ## Summary
 
-WireViz is a simple yet flexible markup language for documenting wires and connector pinouts with beautiful graphical output.
+WireViz is a simple yet flexible markup language for documenting cables, wiring harnesses and connector pinouts with beautiful graphical output.
 
 It is based on [GraphViz](https://www.graphviz.org/) and designed as an "extension" of it. A parser reads a WireViz file and generates valid GraphViz output, which can instantly be rendered to SVG/PNG.
 
@@ -93,11 +93,11 @@ GraphViz code generated by parser:
 
 ## Status
 
-This is very much a work in progress, and mainly an idea in my head.
-A Python module and test scripts is available. Running the test script will generate GraphViz output.
+This is very much a work in progress.
+A Python module and test scripts are available. Running the test script will generate GraphViz output.
 The parser will follow later; contributions are welcome!
 
-# To do
+## To do
 
 * Automate creation of left/right side ports for connectors
 * Add simple connectors (ferrules, cable lugs)
diff --git a/src/example3.py b/src/example3.py
index b0f75d0..25af45e 100644
--- a/src/example3.py
+++ b/src/example3.py
@@ -8,9 +8,9 @@ Harness.add(Node('X2', num_pins=10, ports_left=True))
 Harness.add(Cable('W1', num_wires=10, color_code='IEC'))
 Harness.objects['W1'].connect_all_straight('X1','X2')
 
-Harness.add(Node('X3', num_pins=12, ports_right=True))
-Harness.add(Node('X4', num_pins=12, ports_left=True))
-Harness.add(Cable('W2', num_wires=12, color_code='DIN'))
+Harness.add(Node('X3', num_pins=20, ports_right=True))
+Harness.add(Node('X4', num_pins=20, ports_left=True))
+Harness.add(Cable('W2', num_wires=20, color_code='DIN'))
 Harness.objects['W2'].connect_all_straight('X3','X4')
 
 Harness.add(Node('X5', num_pins=20, ports_right=True))
diff --git a/src/input/header.dot b/src/input/header.dot
index e8b319b..86c0d19 100644
--- a/src/input/header.dot
+++ b/src/input/header.dot
@@ -3,6 +3,6 @@
 // Daniel Rojas - 2020
 
 graph G {
-    graph [rankdir = LR, ranksep=2, fontname = "arial"];
-    edge [fontname = "arial"];
-    node [shape=record, style=rounded, fontname = "arial"];
+    graph [rankdir = "LR", ranksep=2, fontname = "arial", bgcolor="transparent"]
+    edge [fontname = "arial"]
+    node [shape="record", style="rounded,filled", fontname = "arial", fillcolor="white"]
diff --git a/src/wireviz.py b/src/wireviz.py
index 511bfa6..636ab93 100644
--- a/src/wireviz.py
+++ b/src/wireviz.py
@@ -1,8 +1,9 @@
 
-COLOR_CODES = {'DIN': ['WH','BN','GN','YE','GY','PK','BU','RD','BK','VT'],
+COLOR_CODES = {'DIN': ['WH','BN','GN','YE','GY','PK','BU','RD','BK','VT','GYPK','RDBU','WHGN','BNGN','WHYE','YEBN','WHGY','GYBN','WHPK','PKBN'],
                'IEC': ['BN','RD','OG','YE','GN','BU','VT','GY','WH','BK'],
                'BW':  ['BK','WH']}
 
+# TODO: parse and render double-colored cables ('RDBU' etc)
 color_hex = {
              'BK': '#000000',
              'WH': '#ffffff',
@@ -223,7 +224,7 @@ class Cable:
         if self.mm2 is not None:
             e = awg_equiv(self.mm2)
             es = ' ({} AWG)'.format(e) if e is not None else ''
-            mm ='{} mm²{}'.format(self.mm2, es)
+            mm ='{} mm\u00B2{}'.format(self.mm2, es)
             l.append(mm)
         if self.awg is not None:
             l.append('{} AWG'.format(self.awg))