diff --git a/data/bands/native/custom.json b/data/bands/native/custom.json
new file mode 100644
index 00000000..d829d1ae
--- /dev/null
+++ b/data/bands/native/custom.json
@@ -0,0 +1,53 @@
+{"chrBands": ["1 p p1 1 15617197 1 15617197 gpos50",
+ "1 p p1 15617197 17000000 15617197 17000000 acen",
+ "1 q q1 17000000 18051616 17000000 18051616 acen",
+ "1 q q1 18051616 43270923 18051616 43270923 gpos50",
+ "2 p p2 1 12620885 1 12620885 gpos50",
+ "2 p p2 12620885 14000000 12620885 14000000 acen",
+ "2 q q2 14000000 15480028 14000000 15480028 acen",
+ "2 q q2 15480028 35937250 15480028 35937250 gpos50",
+ "3 p q3 1 17882716 1 17882716 gpos50",
+ "3 p q3 17882716 19000000 17882716 19000000 acen",
+ "3 q p3 19000000 20185397 19000000 20185397 acen",
+ "3 q p3 20185397 36413819 20185397 36413819 gpos50",
+ "4 p p4 1 8234513 1 8234513 gpos50",
+ "4 p p4 8234513 9000000 8234513 9000000 acen",
+ "4 q q4 9000000 10055794 9000000 10055794 acen",
+ "4 q q4 10055794 35502694 10055794 35502694 gpos50",
+ "5 p p5 1 11393044 1 11393044 gpos50",
+ "5 p p5 11393044 12000000 11393044 12000000 acen",
+ "5 q q5 12000000 13487138 12000000 13487138 acen",
+ "5 q q5 13487138 29958434 13487138 29958434 gpos50",
+ "6 p p6 1 13200682 1 13200682 gpos50",
+ "6 p p6 13200682 15000000 13200682 15000000 acen",
+ "6 q q6 15000000 17559239 15000000 17559239 acen",
+ "6 q q6 17559239 31248787 17559239 31248787 gpos50",
+ "7 p p7 1 9103739 1 9103739 gpos50",
+ "7 p p7 9103739 11000000 9103739 11000000 acen",
+ "7 q q7 11000000 12716723 11000000 12716723 acen",
+ "7 q q7 12716723 29697621 12716723 29697621 gpos50",
+ "8 p p8 1 11983657 1 11983657 gpos50",
+ "8 p p8 11983657 13000000 11983657 13000000 acen",
+ "8 q q8 13000000 14416278 13000000 14416278 acen",
+ "8 q q8 14416278 28443022 14416278 28443022 gpos50",
+ "9 p p9 1 1211963 1 1211963 gpos50",
+ "9 p p9 1211963 2000000 1211963 2000000 acen",
+ "9 q q9 2000000 3929561 2000000 3929561 acen",
+ "9 q q9 3929561 23012720 3929561 23012720 gpos50",
+ "10 p p10 1 7639733 1 7639733 gpos50",
+ "10 p p10 7639733 8000000 7639733 8000000 acen",
+ "10 q q10 8000000 8625675 8000000 8625675 acen",
+ "10 q q10 8625675 23207287 8625675 23207287 gpos50",
+ "11 p p11 1 11341762 1 11341762 gpos50",
+ "11 p p11 11341762 12000000 11341762 12000000 acen",
+ "11 q q11 12000000 13043189 12000000 13043189 acen",
+ "11 q q11 13043189 29021106 13043189 29021106 gpos50",
+ "12 p p12 1 11058522 1 11058522 gpos50",
+ "12 p p12 11058522 11600000 11058522 11600000 acen",
+ "12 q q12 11600000 12239912 11600000 12239912 acen",
+ "12 q q12 12239912 27531856 12239912 27531856 gpos50",
+ "13 p p13 1 9058522 1 9058522 gpos50",
+ "13 p p13 9058522 11600000 11058522 11600000 acen",
+ "13 q q13 11600000 12239912 11600000 12239912 acen",
+ "13 q q13 12239912 27531856 12239912 27531856 gpos50"]
+}
diff --git a/examples/vanilla/custom-organism.html b/examples/vanilla/custom-organism.html
new file mode 100644
index 00000000..4d6ffbe5
--- /dev/null
+++ b/examples/vanilla/custom-organism.html
@@ -0,0 +1,41 @@
+<!DOCTYPE html>
+<html>
+<head>
+  <title>Custom organism | Ideogram</title>
+  <style>
+    body {font: 14px Arial; line-height: 19.6px; padding: 0 15px;}
+    a, a:visited {text-decoration: none;}
+    a:hover {text-decoration: underline;}
+    a, a:hover, a:visited, a:active {color: #0366d6;}
+  </style>
+  <script type="text/javascript" src="../../dist/js/ideogram.min.js"></script>
+<link rel="icon" type="image/x-icon" href="img/ideogram_favicon.ico">
+</head>
+<body>
+  <h1>Custom organism | Ideogram</h1>
+  <a href="../">Overview</a> |
+  <a href="multiple-primates">Previous</a> |
+  <a href="mouse">Next</a> |
+  <a href="https://github.com/eweitz/ideogram/blob/gh-pages/custom.html" target="_blank">Source</a>
+  <p>
+    A custom genome is depicted below.  The grey and black bands in each chromosome
+    represent
+    <a href="https://en.wikipedia.org/wiki/Heterochromatin">heterochromatin</a>.
+    The pink region is the area around the
+    <a href="https://en.wikipedia.org/wiki/Centromere">centromere</a>, and the blue represents variable regions.
+  </p>
+  <p>
+    This ideogram shows most chromosomes in a
+    <a href="https://en.wikipedia.org/wiki/Ploidy">haploid</a> state for
+    simplicity.  For more accurate, diploid representation of custom genomes,
+    see <a href="ploidy-basic">Ploidy, basic</a> and
+    <a href="multiple-trio">Multiple, trio</a>.
+  </p>
+  <script type="text/javascript">
+
+    var ideogram = new Ideogram({
+      organism: 'custom'
+    });
+  </script>
+</body>
+</html>
