diff --git a/doc/index.html b/doc/index.html
index 52f4afb..0cff7ae 100644
--- a/doc/index.html
+++ b/doc/index.html
@@ -81,6 +81,10 @@
 	<td class="summary">Makes a Filter that rejects Entities with at least one of the specified
  Components and Filters, and selects all other Entities.</td>
 	</tr>
+	<tr>
+	<td class="name" nowrap><a href="#tiny.filter">tiny.filter (pattern)</a></td>
+	<td class="summary">Makes a Filter from a string.</td>
+	</tr>
 </table>
 <h2><a href="#System_functions">System functions </a></h2>
 <table class="function_list">
@@ -178,7 +182,7 @@
  Filters take two parameters, the System and the Entity, and return a boolean
  value indicating if the Entity should be processed by the System.</p>
 
-<p> Filters must be added to Systems by setting the <code>filter</code> field of the System.
+<p> Filters must be added to Systems by setting the <a href="index.html#tiny.filter">filter</a> field of the System.
  Filter's returned by tiny-ecs's Filter functions are immutable and can be
  used by multiple Systems.</p>
 
@@ -276,6 +280,34 @@ filter = tiny.requireAll("image", tiny.rejectAny("Player", "Enemy"))
 
 
 
+</dd>
+    <dt>
+    <a name = "tiny.filter"></a>
+    <strong>tiny.filter (pattern)</strong>
+    </dt>
+    <dd>
+
+<p>Makes a Filter from a string.  Syntax of <code>pattern</code> is as follows.</p>
+
+<ul>
+    <li>Tokens are alphanumeric strings including underscores.</li>
+    <li>Tokens can be separated by |, &amp;, or surrounded by parentheses.</li>
+    <li>Tokens can be prefixed with !, and are then operated on with a boolean 'not'.</li>
+</ul>
+
+<p> Examples are best:</p>
+<pre><code>'a|b|c' - Matches entities with an 'a' component OR a 'b' component or a 'c' component.
+'a&amp;!b&amp;c' - Matches entities with an 'a' component AND NOT a 'b' component AND a 'c' component.
+'a|(b&amp;c&amp;d)|e - Matches 'a' OR ('b' AND 'c' AND 'd') OR 'e'
+</code></pre>
+
+
+
+
+
+
+
+
 </dd>
 </dl>
     <h2 class="section-header has-description"><a name="System_functions"></a>System functions </h2>
@@ -576,9 +608,9 @@ end
     <strong>tiny.update (world, dt, filter)</strong>
     </dt>
     <dd>
-    Updates the World by dt (delta time).  Takes an optional parameter, <code>filter</code>,
+    Updates the World by dt (delta time).  Takes an optional parameter, <a href="index.html#tiny.filter">filter</a>,
  which is a Filter that selects Systems from the World, and updates only those
- Systems. If <code>filter</code> is not supplied, all Systems are updated. Put this
+ Systems. If <a href="index.html#tiny.filter">filter</a> is not supplied, all Systems are updated. Put this
  function in your main loop.
 
 
@@ -682,7 +714,7 @@ end
 </div> <!-- id="main" -->
 <div id="about">
 <i>generated by <a href="http://github.com/stevedonovan/LDoc">LDoc 1.4.3</a></i>
-<i style="float:right;">Last updated 2015-09-08 16:29:08 </i>
+<i style="float:right;">Last updated 2016-03-05 16:37:42 </i>
 </div> <!-- id="about" -->
 </div> <!-- id="container" -->
 </body>