diff --git a/modules/home/users/msyds/emacs/init.el b/modules/home/users/msyds/emacs/init.el
index 68788e4..4a433b6 100755
--- a/modules/home/users/msyds/emacs/init.el
+++ b/modules/home/users/msyds/emacs/init.el
@@ -65,6 +65,7 @@
     syd/wgrep
     syd/nix
     syd/backup
+    syd/asciidoc
     syd/flycheck
     syd/agda
     syd/rust
@@ -77,5 +78,6 @@
     syd/transient
     syd/scheme
     syd/bookmark
+    syd/markdown
     syd/haskell
     syd/qbe))
diff --git a/modules/home/users/msyds/emacs/lisp/syd/asciidoc.el b/modules/home/users/msyds/emacs/lisp/syd/asciidoc.el
new file mode 100644
index 0000000..881f67b
--- /dev/null
+++ b/modules/home/users/msyds/emacs/lisp/syd/asciidoc.el
@@ -0,0 +1,11 @@
+;; -*- lexical-binding: t; -*-
+
+(require 'syd/base)
+(require 'syd/prose)
+(require 'syd/edit-indirect)
+
+(use-package asciidoc-mode
+  :init
+  (add-hook 'asciidoc-mode-hook #'syd-prose-mode))
+
+(provide 'syd/asciidoc)
diff --git a/modules/home/users/msyds/emacs/lisp/syd/edit-indirect.el b/modules/home/users/msyds/emacs/lisp/syd/edit-indirect.el
new file mode 100644
index 0000000..4718494
--- /dev/null
+++ b/modules/home/users/msyds/emacs/lisp/syd/edit-indirect.el
@@ -0,0 +1,7 @@
+;; -*- lexical-binding: t; -*-
+
+(require 'syd/base)
+
+(use-package edit-indirect)
+
+(provide 'syd/edit-indirect)
diff --git a/modules/home/users/msyds/emacs/lisp/syd/markdown.el b/modules/home/users/msyds/emacs/lisp/syd/markdown.el
index b1b2cfb..eb79697 100644
--- a/modules/home/users/msyds/emacs/lisp/syd/markdown.el
+++ b/modules/home/users/msyds/emacs/lisp/syd/markdown.el
@@ -1,9 +1,13 @@
 ;; -*- lexical-binding: t; -*-
 
 (require 'syd/base)
+(require 'syd/prose)
+(require 'syd/edit-indirect)
 
 (use-package markdown-mode
-  :config
+  :mode ("README\\.md\\'" . gfm-mode)
+  :custom ((markdown-header-scaling t))
+  :init
   (add-hook 'markdown-mode-hook #'syd-prose-mode))
 
 (provide 'syd/markdown)
diff --git a/modules/home/users/msyds/emacs/lisp/syd/prose.el b/modules/home/users/msyds/emacs/lisp/syd/prose.el
index 9222d70..756a79a 100755
--- a/modules/home/users/msyds/emacs/lisp/syd/prose.el
+++ b/modules/home/users/msyds/emacs/lisp/syd/prose.el
@@ -51,5 +51,4 @@
   "A minor mode for writing prose."
   :lighter nil)
 
-
 (provide 'syd/prose)
diff --git a/modules/home/users/msyds/emacs/nix/tree-sitter-asciidoc.nix b/modules/home/users/msyds/emacs/nix/tree-sitter-asciidoc.nix
new file mode 100644
index 0000000..0c28adf
--- /dev/null
+++ b/modules/home/users/msyds/emacs/nix/tree-sitter-asciidoc.nix
@@ -0,0 +1,29 @@
+{ fetchFromGitHub
+, tree-sitter
+}:
+
+let
+  version = "git";
+
+  repo = fetchFromGitHub {
+    owner = "cathaysia";
+    repo = "tree-sitter-asciidoc";
+    # tag = "v${version}";
+    rev = "882e43173427b831cd0d98ab3525501bed6ea214";
+    hash = "sha256-55wgct1QB7Sg6tReZHgMK+Mn4wL+p1YU/1WPPjeUMvc=";
+  };
+in {
+  tree-sitter-asciidoc =
+    tree-sitter.buildGrammar {
+      language = "asciidoc";
+      inherit version;
+      src = "${repo}/tree-sitter-asciidoc";
+    };
+
+  tree-sitter-asciidoc-inline =
+    tree-sitter.buildGrammar {
+      language = "asciidoc_inline";
+      inherit version;
+      src = "${repo}/tree-sitter-asciidoc_inline";
+    };
+}
diff --git a/modules/home/users/msyds/emacs/nix/treesit.nix b/modules/home/users/msyds/emacs/nix/treesit.nix
index f1b4994..804a430 100644
--- a/modules/home/users/msyds/emacs/nix/treesit.nix
+++ b/modules/home/users/msyds/emacs/nix/treesit.nix
@@ -9,30 +9,35 @@ in {
   config = lib.mkIf cfg.enable
     # https://github.com/dschrempf/haskell-ts-mode/blob/1c236f00dc214e546124a5dac90902ba62500c15/flake.nix#L40-L55
     (let
+      ts-asciidoc = pkgs.callPackage ./tree-sitter-asciidoc.nix {};
+
       grammars = pkgs.tree-sitter-grammars.overrideScope (ts-final: ts-prev: {
         tree-sitter-haskell = ts-prev.tree-sitter-haskell.overrideAttrs (prev:
-          let rev = "1ad6077a1fb776c255836e00aeb6da57ba564b6a";
-          in {
-            version = "unstable-2026-07-07-${builtins.substring 0 7 rev}";
-            src = pkgs.fetchFromGitHub {
-              owner = "dschrempf";
-              repo = "tree-sitter-haskell";
-              inherit rev;
-              hash = "sha256-kC6HwImFRx5HUY7NDLAA0I/DaSstQ94dWxA9+lMx2gI=";
-            };
-            nativeBuildInputs = (prev.nativeBuildInputs or [ ]) ++ [
-              pkgs.nodejs
-              pkgs.tree-sitter
-            ];
-            preBuild = ''
-              tree-sitter generate
-            '';
-          });
+        let rev = "1ad6077a1fb776c255836e00aeb6da57ba564b6a";
+        in {
+          version = "unstable-2026-07-07-${builtins.substring 0 7 rev}";
+          src = pkgs.fetchFromGitHub {
+            owner = "dschrempf";
+            repo = "tree-sitter-haskell";
+            inherit rev;
+            hash = "sha256-kC6HwImFRx5HUY7NDLAA0I/DaSstQ94dWxA9+lMx2gI=";
+          };
+          nativeBuildInputs = (prev.nativeBuildInputs or [ ]) ++ [
+            pkgs.nodejs
+            pkgs.tree-sitter
+          ];
+          preBuild = ''
+            tree-sitter generate
+          '';
+        });
       });
     in {
       sydnix.emacs.emacsPackages = epkgs: [
         (epkgs.treesit-grammars.with-grammars (_ps:
-          grammars.allGrammars
+          grammars.allGrammars ++ [
+            ts-asciidoc.tree-sitter-asciidoc
+            ts-asciidoc.tree-sitter-asciidoc-inline
+          ]
         ))
       ];
     });