Update docs/specification/draft/basic/authorization.mdx

Co-authored-by: Den Delimarsky <[email protected]>

Author: aaronpk

docs/specification/draft/basic/authorization.mdx

@@ -540,6 +540,6 @@ There are several authorization extensions to the core protocol that define addi
 - **Composable** - Extensions are modular and designed to work together without conflicts, allowing implementations to adopt multiple extensions simultaneously
 - **Versioned independently** - Extensions follow the core MCP versioning cycle but may adopt independent versioning as needed
 
-A list of supported extensions can be found here:
+A list of supported extensions can be found in the [MCP Authorization Extensions](https://github.com/modelcontextprotocol/ext-auth) repository.
 
 [modelcontextprotocol/ext-auth](https://github.com/modelcontextprotocol/ext-auth)