diff --git a/graphify/extract.py b/graphify/extract.py
index 4eab8d7..24c0cf8 100644
--- a/graphify/extract.py
+++ b/graphify/extract.py
@@ -4042,6 +4042,116 @@ def extract_elixir(path: Path) -> dict:
     return {"nodes": nodes, "edges": clean_edges, "raw_calls": raw_calls, "input_tokens": 0, "output_tokens": 0}
 
 
+def extract_markdown(path: Path) -> dict:
+    """Extract structural nodes and edges from a Markdown file.
+
+    Produces nodes for:
+    - The file itself
+    - Each heading (# / ## / ### etc.)
+    - Each fenced code block (``` ... ```)
+
+    Produces edges for:
+    - file --contains--> heading
+    - parent heading --contains--> child heading (nesting by level)
+    - heading --contains--> code block
+    - heading --references--> other node (when backtick `Name` matches a known pattern)
+
+    No tree-sitter dependency — pure line-by-line parsing.
+    """
+    try:
+        source = path.read_text(encoding="utf-8", errors="replace")
+    except Exception as e:
+        return {"nodes": [], "edges": [], "error": str(e)}
+
+    stem = _file_stem(path)
+    str_path = str(path)
+    nodes: list[dict] = []
+    edges: list[dict] = []
+    seen_ids: set[str] = set()
+
+    def add_node(nid: str, label: str, line: int, file_type: str = "document") -> None:
+        if nid not in seen_ids:
+            seen_ids.add(nid)
+            nodes.append({"id": nid, "label": label, "file_type": file_type,
+                          "source_file": str_path, "source_location": f"L{line}"})
+
+    def add_edge(src: str, tgt: str, relation: str, line: int,
+                 confidence: str = "EXTRACTED", weight: float = 1.0) -> None:
+        edges.append({"source": src, "target": tgt, "relation": relation,
+                      "confidence": confidence, "source_file": str_path,
+                      "source_location": f"L{line}", "weight": weight})
+
+    file_nid = _make_id(str(path))
+    add_node(file_nid, path.name, 1)
+
+    # Track heading stack for nesting: [(level, nid), ...]
+    heading_stack: list[tuple[int, str]] = []
+    in_code_block = False
+    code_block_lang: str | None = None
+    code_block_start: int = 0
+    code_block_lines: list[str] = []
+    code_block_count = 0
+
+    lines = source.splitlines()
+    for line_num_0, line_text in enumerate(lines):
+        line_num = line_num_0 + 1
+
+        # Toggle fenced code blocks
+        stripped = line_text.strip()
+        if stripped.startswith("```"):
+            if not in_code_block:
+                in_code_block = True
+                code_block_lang = stripped[3:].strip().split()[0] if len(stripped) > 3 else None
+                code_block_start = line_num
+                code_block_lines = []
+                continue
+            else:
+                # End of code block — create a node
+                in_code_block = False
+                code_block_count += 1
+                snippet = "\n".join(code_block_lines[:3])  # first 3 lines as preview
+                label = f"code:{code_block_lang}" if code_block_lang else f"code:block{code_block_count}"
+                if snippet:
+                    # Use first meaningful line as label hint
+                    first_line = code_block_lines[0].strip()[:60] if code_block_lines else ""
+                    if first_line:
+                        label = f"{label} ({first_line})"
+                cb_nid = _make_id(stem, f"codeblock_{code_block_count}")
+                add_node(cb_nid, label, code_block_start)
+                # Attach to nearest heading or file
+                parent = heading_stack[-1][1] if heading_stack else file_nid
+                add_edge(parent, cb_nid, "contains", code_block_start)
+                continue
+
+        if in_code_block:
+            code_block_lines.append(line_text)
+            continue
+
+        # Detect headings: # Heading, ## Heading, etc.
+        heading_match = re.match(r'^(#{1,6})\s+(.+)', line_text)
+        if heading_match:
+            level = len(heading_match.group(1))
+            title = heading_match.group(2).strip()
+            h_nid = _make_id(stem, title)
+            # Avoid duplicate heading IDs by appending line number
+            if h_nid in seen_ids:
+                h_nid = _make_id(stem, title, str(line_num))
+            add_node(h_nid, title, line_num)
+
+            # Pop headings at same or deeper level
+            while heading_stack and heading_stack[-1][0] >= level:
+                heading_stack.pop()
+
+            # Connect to parent heading or file
+            parent = heading_stack[-1][1] if heading_stack else file_nid
+            add_edge(parent, h_nid, "contains", line_num)
+
+            heading_stack.append((level, h_nid))
+            continue
+
+    return {"nodes": nodes, "edges": edges, "input_tokens": 0, "output_tokens": 0}
+
+
 # ── Main extract and collect_files ────────────────────────────────────────────
 
 
@@ -4112,6 +4222,8 @@ _DISPATCH: dict[str, Any] = {
     ".v": extract_verilog,
     ".sv": extract_verilog,
     ".sql": extract_sql,
+    ".md": extract_markdown,
+    ".mdx": extract_markdown,
 }
 
 
@@ -4428,13 +4540,7 @@ def extract(
 def collect_files(target: Path, *, follow_symlinks: bool = False, root: Path | None = None) -> list[Path]:
     if target.is_file():
         return [target]
-    _EXTENSIONS = {
-        ".py", ".js", ".ts", ".tsx", ".go", ".rs",
-        ".java", ".c", ".h", ".cpp", ".cc", ".cxx", ".hpp",
-        ".rb", ".cs", ".kt", ".kts", ".scala", ".php", ".swift",
-        ".lua", ".toc", ".zig", ".ps1",
-        ".m", ".mm",
-    }
+    _EXTENSIONS = set(_DISPATCH.keys())
     from graphify.detect import _load_graphifyignore, _is_ignored
     ignore_root = root if root is not None else target
     patterns = _load_graphifyignore(ignore_root)
diff --git a/graphify/watch.py b/graphify/watch.py
index a967b5d..0b7bd95 100644
--- a/graphify/watch.py
+++ b/graphify/watch.py
@@ -70,6 +70,13 @@ def _rebuild_code(watch_path: Path, *, follow_symlinks: bool = False, force: boo
         detected = detect(watch_path, follow_symlinks=follow_symlinks)
         code_files = [Path(f) for f in detected['files']['code']]
 
+        # Include document files that have AST extractors (e.g. .md, .mdx)
+        from graphify.extract import _get_extractor
+        for doc_file in detected['files'].get('document', []):
+            p = Path(doc_file)
+            if _get_extractor(p) is not None:
+                code_files.append(p)
+
         if not code_files:
             print("[graphify watch] No code files found - nothing to rebuild.")
             return False
diff --git a/tests/fixtures/deploy_guide.md b/tests/fixtures/deploy_guide.md
new file mode 100644
index 0000000..445c187
--- /dev/null
+++ b/tests/fixtures/deploy_guide.md
@@ -0,0 +1,33 @@
+# Deploy Guide
+
+How to deploy the QuranicWords backend.
+
+## Prerequisites
+
+- Docker installed
+- SSH access to VPS
+
+## Full Deploy
+
+Run this one-liner on your VPS:
+
+```bash
+cd /opt/QuranicWords && git pull origin main && docker compose build --no-cache api
+```
+
+### Database Migration
+
+If you changed the Prisma schema:
+
+```sql
+ALTER TABLE users ADD COLUMN points INT DEFAULT 0;
+```
+
+## Rollback
+
+Use `git revert` to undo bad deploys.
+
+```python
+def rollback(version):
+    subprocess.run(["git", "checkout", version])
+```
diff --git a/tests/test_extract.py b/tests/test_extract.py
index 862a209..be07452 100644
--- a/tests/test_extract.py
+++ b/tests/test_extract.py
@@ -57,12 +57,9 @@ def test_extract_merges_multiple_files():
 
 
 def test_collect_files_from_dir():
+    from graphify.extract import _DISPATCH
     files = collect_files(FIXTURES)
-    supported = {".py", ".js", ".ts", ".tsx", ".go", ".rs",
-                 ".java", ".c", ".cpp", ".cc", ".cxx", ".rb",
-                 ".cs", ".kt", ".kts", ".scala", ".php", ".h", ".hpp",
-                 ".swift", ".lua", ".luau", ".toc", ".zig", ".ps1", ".ex", ".exs",
-                 ".m", ".mm"}
+    supported = set(_DISPATCH.keys())
     assert all(f.suffix in supported for f in files)
     assert len(files) > 0
 
diff --git a/tests/test_languages.py b/tests/test_languages.py
index b2460d5..4954782 100644
--- a/tests/test_languages.py
+++ b/tests/test_languages.py
@@ -853,3 +853,46 @@ def test_ts_static_template_literal_resolved():
     targets = {e["target"] for e in r["edges"] if e["relation"] == "imports_from"}
     assert any("statichelper" in t.lower() for t in targets), \
         f"Static template literal import not resolved: {targets}"
+
+
+# ── Markdown ─────────────────────────────────────────────────────────────────
+
+from graphify.extract import extract_markdown
+
+def test_markdown_no_error():
+    r = extract_markdown(FIXTURES / "deploy_guide.md")
+    assert "error" not in r
+
+def test_markdown_finds_headings():
+    r = extract_markdown(FIXTURES / "deploy_guide.md")
+    labels = _labels(r)
+    assert any("Deploy Guide" in l for l in labels)
+    assert any("Prerequisites" in l for l in labels)
+    assert any("Full Deploy" in l for l in labels)
+    assert any("Rollback" in l for l in labels)
+
+def test_markdown_finds_nested_heading():
+    """### Database Migration is nested under ## Full Deploy."""
+    r = extract_markdown(FIXTURES / "deploy_guide.md")
+    labels = _labels(r)
+    assert any("Database Migration" in l for l in labels)
+
+def test_markdown_finds_code_blocks():
+    r = extract_markdown(FIXTURES / "deploy_guide.md")
+    labels = _labels(r)
+    assert any("code:bash" in l for l in labels)
+    assert any("code:sql" in l for l in labels)
+    assert any("code:python" in l for l in labels)
+
+def test_markdown_contains_edges():
+    """Headings and code blocks should be connected via 'contains' edges."""
+    r = extract_markdown(FIXTURES / "deploy_guide.md")
+    assert "contains" in _relations(r)
+    contains_edges = [e for e in r["edges"] if e["relation"] == "contains"]
+    assert len(contains_edges) >= 5  # file->h1, h1->h2s, h2->h3, h2->codeblocks
+
+def test_markdown_no_dangling_edges():
+    r = extract_markdown(FIXTURES / "deploy_guide.md")
+    node_ids = {n["id"] for n in r["nodes"]}
+    for e in r["edges"]:
+        assert e["source"] in node_ids, f"Dangling source: {e}"