diff --git a/api.md b/api.md
index c29ef01..f870eea 100644
--- a/api.md
+++ b/api.md
@@ -2,15 +2,15 @@
 
 <pre>
 <a href="">api</a>
-<a href="">api.parser.json</a>
+<a href="src/lib/json.lua">api.parser.json</a>
 <a href="#api-parser-xml">api.parser.xml</a>
-<a href="">api.url</a>
-<a href="">api.util</a>
+<a href="src/lib/url.lua">api.url</a>
+<a href="src/util.lua">api.util</a>
 <a href="">api.protocol</a>
-<a href="">api.ext.*</a>
+<a href="#api-ext-*">api.ext.*</a>
 <a href="#api-ext-exec">api.ext.exec(fn, ,..)</a>
-<a href="https://bakpakin.github.io/tiny-ecs/doc">api.ecs</a>
-<a href="https://bakpakin.github.io/tiny-ecs/doc">api.world</a>
+<a href="#entity-component-system-ecs">api.ecs</a>
+<a href="#entity-component-system-ecs">api.world</a>
 </pre>
 
 ## Entity Component System (ECS)
@@ -79,6 +79,11 @@ util.traverseXML( xml:ParseXmlText(testXml),  function(node,raw)
 end)
 ```
 
+## api.ext.*
+
+This is where extensions live.
+See the [skeleton extension](src/ext/skeleton/main.lua) for a typical extension startingpoint.
+
 ## api.ext.exec
 
 This allows batch-firing a function on each extension (if exist)