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diff --git a/docs/extensions/index.md b/docs/extensions/index.md
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--- a/docs/extensions/index.md
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@@ -40,6 +40,7 @@ available to you.
 * [Meta-Data](meta_data.html)
 * [New Line to Break](nl2br.html)
 * [RSS](rss.html)
+* [Sane Lists](sane_lists.html)
 * [Table of Contents](toc.html)
 * [WikiLinks](wikilinks.html)
 
diff --git a/docs/extensions/sane_lists.md b/docs/extensions/sane_lists.md
new file mode 100644
index 0000000..b1c1d06
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+++ b/docs/extensions/sane_lists.md
@@ -0,0 +1,75 @@
+Sane Lists
+----------
+
+Summary
+-------
+
+The Sane Lists Extension alters the behavior of the Markdown List syntax
+to be less surprising.
+
+This extension is included in the standard Markdown library.
+
+Syntax
+------
+
+Sane Lists do not allow the mixing of list types. In other words, an ordered
+list will not continue when an unordered list item is encountered and
+vice versa. For example:
+
+    1. Ordered item 1
+    2. Ordered item 2
+
+    * Unordered item 1
+    * Unordered item 2
+
+will result in the following output:
+
+    <ol>
+      <li>Ordered item 1</li>
+      <li>Ordered item 2</li>
+    </ol>
+
+    <ul>
+      <li>Unordered item 1</li>
+      <li>Unordered item 2</li>
+    </ul>
+
+Whereas the default Markdown behavior would be to generate an unordered list.
+
+Note that, unlike the default Markdown behavior, if a blank line is not
+included between list items, the different list type is ignored completely. 
+This corresponds to the behavior of paragraphs. For example:
+
+    A Paragraph.
+    * Not a list item.
+
+    1. Ordered list item.
+    * Not a separate list item.
+
+With this extension the above will result in the following output:
+
+    <p>A Paragraph.
+    * Not a list item.</p>
+
+    <ol>
+      <li>Ordered list item.
+      * Not a separate list item.</li>
+    </ol>
+
+In all other ways, Sane Lists should behave as normal Markdown lists.
+
+Usage
+-----
+
+From the Python interpreter:
+
+    >>> html = markdown.markdown(text, ['sane_lists'])
+
+To use with other extensions, just add them to the list, like this:
+
+    >>> html = markdown.markdown(text, ['def_list', 'sane_lists'])
+
+The extension can also be called from the command line using Markdown's `-x` 
+parameter:
+
+    python -m markdown -x sane_lists source.txt > output.html