diff --git a/docs/index.html b/docs/index.html
index a5a70385..deb57353 100644
--- a/docs/index.html
+++ b/docs/index.html
@@ -65,6 +65,73 @@ that may not directly discuss HTML Purifier.</p>
 <dd>Credits and links to DevNetwork forum topics.</dd>
 </dl>
 
+<h2>Internal memos</h2>
+
+<p>Plaintext documents that are more for use by active developers of
+the code. They may be upgraded to HTML files or stay as TXT scratchpads.</p>
+
+<table class="table">
+
+<thead><tr>
+    <th width="10%">Type</th>
+    <th width="20%">Name</th>
+    <th>Description</th>
+</tr></thead>
+
+<tbody>
+
+<tr>
+    <td>End-user</td>
+    <td><a href="enduser-overview.txt">Overview</a></td>
+    <td>High level overview of the general control flow (mostly obsolete).</td>
+</tr>
+
+<tr>
+    <td>End-user</td>
+    <td><a href="enduser-security.txt">Security</a></td>
+    <td>Common security issues that may still arise (half-baked).</td>
+</tr>
+
+<tr>
+    <td>Proposal</td>
+    <td><a href="proposal-filter-levels.txt">Filter levels</a></td>
+    <td>Outlines details of projected configurable level of filtering.</td>
+</tr>
+
+<tr>
+    <td>Proposal</td>
+    <td><a href="proposal-language.txt">Language</a></td>
+    <td>Specification of I18N for error messages derived from MediaWiki (half-baked).</td>
+</tr>
+
+<tr>
+    <td>Proposal</td>
+    <td><a href="proposal-new-directives.txt">New directives</a></td>
+    <td>Assorted configuration options that could be implemented.</td>
+</tr>
+
+<tr>
+    <td>Reference</td>
+    <td><a href="ref-loose-vs-strict.txt">Loose vs.Strict</a></td>
+    <td>Differences between HTML Strict and Transitional versions.</td>
+</tr>
+
+<tr>
+    <td>Reference</td>
+    <td><a href="ref-proprietary-tags.txt">Proprietary tags</a></td>
+    <td>List of vendor-specific tags we may want to transform to W3C compliant markup.</td>
+</tr>
+
+<tr>
+    <td>Reference</td>
+    <td><a href="ref-strictness.txt">Strictness</a></td>
+    <td>Short essay on how loose definition isn't really loose.</td>
+</tr>
+
+</tbody>
+
+</table>
+
 <div id="version">$Id$</div>
 </body>
 </html>
\ No newline at end of file
diff --git a/docs/ref-proprietary-tags.txt b/docs/ref-proprietary-tags.txt
index b96c3735..cf0b60fc 100644
--- a/docs/ref-proprietary-tags.txt
+++ b/docs/ref-proprietary-tags.txt
@@ -8,10 +8,13 @@ HTML Purifier context.
 
 <align>, block element that aligns (extremely rare)
 <blackface>, inline that double-bolds text (extremely rare)
-<multicol>, multiple columns
+<comment>, hidden comment for IE and WebTV
+<multicol cols=number gutter=pixels width=pixels>, multiple columns
 <nobr>, no linebreaks
-<spacer>, whitespace in doc
-<wbr>, allows linebreaks
+<spacer align=* type="vertical|horizontal|block">, whitespace in doc,
+    use width/height for block and size for vertical/horizontal (attributes)
+    (extremely rare)
+<wbr>, potential word break point: allows linebreaks. Only works in <nobr>
 
 <listing>, monospace pre-variant (extremely rare)
 <plaintext>, escapes all tags to the end of document