diff --git a/.todo b/.todo
index de9f550..ce1ba5d 100644
--- a/.todo
+++ b/.todo
@@ -1,4 +1,3 @@
-document anaglym invocation
 document color value ranges
 document 3D coordinate system
 add audio capabilities
diff --git a/doc/index.html b/doc/index.html
index 120e550..f948076 100644
--- a/doc/index.html
+++ b/doc/index.html
@@ -21,6 +21,12 @@ The library functions are documented below.
 </p>
 
 <ul>
+    <li>
+        <a href="#overview">Overview</a>
+        <ul>
+            <li><a href="#invocation">Invocation</a></li>
+        </ul>
+    </li>
     <li>
         <a href="#ag"><tt>ag</tt> library</a>
         <ul>
@@ -35,6 +41,26 @@ The library functions are documented below.
 
 <hr />
 
+<a name="overview" />
+<h2>Overview</h2>
+
+<a name="invocation" />
+<h3>Anaglym Invocation</h3>
+
+<p><tt>anaglym</tt> usage:</p>
+<pre>    anaglym [options] script-file</pre>
+<p>
+<tt>anaglym</tt> command-line options:
+<ul>
+    <li><tt>-w width</tt> - specify the width in pixels of the window</li>
+    <li><tt>-h height</tt> - specify the height in pixels of the window</li>
+    <li><tt>-f</tt> - do not fullscreen window</li>
+    <li><tt>-g</tt> - do not grab mouse input</li>
+</ul>
+</p>
+
+<hr />
+
 <a name="ag" />
 <h2><tt>ag</tt> library</h2>