diff --git a/doc/outline.txt b/doc/outline.txt
index 9d6e436..f51d1c7 100644
--- a/doc/outline.txt
+++ b/doc/outline.txt
@@ -428,6 +428,9 @@ server to be configured for the requested buffer) - For JSX support,
 `javascript` parser for treesitter is required 1. Markdown (no external
 requirements) 1. Norg (requires `norg` parser for treesitter)
 
+External providers: - Asciidoc
+<https://github.com/msr1k/outline-asciidoc-provider.nvim>
+
 
 EXTERNAL PROVIDERS ~