diff --git a/errata.html b/errata.html
new file mode 100644
index 0000000..f2a02d1
--- /dev/null
+++ b/errata.html
@@ -0,0 +1,27 @@
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+	  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
+<head>
+  <title>The Go Programming Language - Errata</title>
+  <link rel="stylesheet" type="text/css" href="style.css" />
+  <style>
+body {
+	width:	38em;
+	margin: auto;
+}
+pre {
+	padding-left: 1em;
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+  </style>
+</head>
+<body>
+  <h1>Errata</h1>
+  <p>
+    <b>p.13</b>: As printed, the <code>gopl.io/ch1/lissajous</code> program
+    is deterministic, not random.  We've added this statement to
+    the downloadable program so that it prints a pseudo-random image
+    each time it is run. (Thanks to Randall McPherson.)
+  </p>
+  <pre>rand.Seed(time.Now().UTC().UnixNano())</pre>
+</body>
+</html>
diff --git a/index.html b/index.html
index 2a069b5..4b00210 100644
--- a/index.html
+++ b/index.html
@@ -1,61 +1,10 @@
-<html>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
+	  "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml">
 <head>
-<meta name="go-import" content="gopl.io git https://github.com/adonovan/gopl.io"></meta>
-<title>The Go Programming Language</title>
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-#toc h1 {
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-	text-align:	left
-}
-</style>
-<script>
+  <meta name="go-import" content="gopl.io git https://github.com/adonovan/gopl.io"></meta>
+  <title>The Go Programming Language</title>
+  <script>
   (function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
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@@ -63,7 +12,34 @@ p {
 
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-</script>
+  </script>
+  <link rel="stylesheet" type="text/css" href="style.css" />
+  <style>
+.bio {
+	font-size:	95%;
+	text-align:	justify;
+}
+.biblio {
+	margin:		0.5em;
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+	font-weight:    normal;
+}
+hr {
+	border:		0;
+	border-top:	thin solid #ccc
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+  </style>
 </head>
 <body>
 <table><tr>
@@ -77,8 +53,8 @@ p {
 </br>
 </td>
 <td width='500'>
-<h1>The Go Programming Language</h1>
-<p class='center'>
+<h1 class='center'>The Go Programming Language</h1>
+<p class='biblio center'>
 Alan A. A. Donovan &middot; Brian W. Kernighan<br/>
 Arriving October 30, 2015 in paperback and e-book<br/>
 Addison-Wesley; 380pp; ISBN:&nbsp;978-0134190440<br/>
@@ -97,6 +73,8 @@ Addison-Wesley; 380pp; ISBN:&nbsp;978-0134190440<br/>
 <h1>4. Composite Types</h1>
 <h1>5. Functions</h1>
 <h1>6. Methods</h1>
+<hr/>
+<h1><a href='https://github.com/adonovan/gopl.io/'>Source code</a></h1>
 </td>
 <td>
 <h1>7. Interfaces</h1>
@@ -107,8 +85,11 @@ Addison-Wesley; 380pp; ISBN:&nbsp;978-0134190440<br/>
 <h1>12. Reflection</h1>
 <h1>13. Low-Level Programming</h1>
 <h1>Index  [<a href='ch1.pdf'/>PDF</a>]</h1>
+<hr/>
+<h1><a href='errata.html'>Errata</a></h1>
 </td>
-</tr></table>
+</tr>
+</table>
 </div>
 
 <p class="bio">
diff --git a/style.css b/style.css
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