diff --git a/native-datatypes.html b/native-datatypes.html
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--- a/native-datatypes.html
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@@ -22,7 +22,7 @@ body{counter-reset:h1 2}
 <p>Python has many native datatypes. Here are the important ones:
 <ol>
 <li><b>Booleans</b> are either <code>True</code> or <code>False</code>.
-<li><b>Numbers</b> can be integers (<code>1</code> and <code>2</code>), floats (<code>1.1</code> and <code>1.2</code>), fractions (<code>1/2</code> and <code>2/3</code>), or even complex numbers (<code><var>i</var></code>, the square root of <code>-1</code>).
+<li><b>Numbers</b> can be integers (<code>1</code> and <code>2</code>), floats (<code>1.1</code> and <code>1.2</code>), fractions (<code>1/2</code> and <code>2/3</code>), or even <a href=http://en.wikipedia.org/wiki/Complex_number>complex numbers</a>.
 <li><b>Strings</b> are sequences of Unicode characters, <i>e.g.</i> an <abbr>HTML</abbr> document.
 <li><b>Bytes</b> and <b>byte arrays</b>, <i>e.g.</i> a <abbr>JPEG</abbr> image file.
 <li><b>Lists</b> are ordered sequences of values.