diff --git a/graphify/__main__.py b/graphify/__main__.py
index 638df197c..10bb2799f 100644
--- a/graphify/__main__.py
+++ b/graphify/__main__.py
@@ -1067,6 +1067,7 @@ def main() -> None:
         print("    --label NAME            project label in header")
         print("  benchmark [graph.json]  measure token reduction vs naive full-corpus approach")
         print("  hook install            install post-commit/post-checkout git hooks (all platforms)")
+        print("    --with-wiki             also rebuild the wiki on each commit (#549)")
         print("  hook uninstall          remove git hooks")
         print("  hook status             check if git hooks are installed")
         print("  gemini install          write GEMINI.md section + BeforeTool hook (Gemini CLI)")
@@ -1232,13 +1233,14 @@ def main() -> None:
         from graphify.hooks import install as hook_install, uninstall as hook_uninstall, status as hook_status
         subcmd = sys.argv[2] if len(sys.argv) > 2 else ""
         if subcmd == "install":
-            print(hook_install(Path(".")))
+            with_wiki = "--with-wiki" in sys.argv[3:]
+            print(hook_install(Path("."), with_wiki=with_wiki))
         elif subcmd == "uninstall":
             print(hook_uninstall(Path(".")))
         elif subcmd == "status":
             print(hook_status(Path(".")))
         else:
-            print("Usage: graphify hook [install|uninstall|status]", file=sys.stderr)
+            print("Usage: graphify hook [install [--with-wiki] | uninstall | status]", file=sys.stderr)
             sys.exit(1)
     elif cmd == "query":
         if len(sys.argv) < 3:
diff --git a/graphify/hooks.py b/graphify/hooks.py
index eebd92ae0..07bdd29e0 100644
--- a/graphify/hooks.py
+++ b/graphify/hooks.py
@@ -42,10 +42,43 @@
 fi
 """
 
-_HOOK_SCRIPT = """\
+_WIKI_REBUILD_PYTHON = """
+# Optional wiki rebuild (#549 - 'graphify hook install --with-wiki')
+try:
+    import json as _json
+    out_dir = Path('graphify-out')
+    graph_json = out_dir / 'graph.json'
+    if graph_json.exists():
+        from graphify.build import build_from_json
+        from graphify.cluster import cluster, score_all
+        from graphify.analyze import god_nodes
+        from graphify.wiki import to_wiki
+        graph_data = _json.loads(graph_json.read_text(encoding='utf-8'))
+        G2 = build_from_json(graph_data)
+        comms = cluster(G2)
+        cohesion = score_all(G2, comms)
+        gods = god_nodes(G2)
+        labels_path = out_dir / '.graphify_labels.json'
+        labels = {}
+        if labels_path.exists():
+            labels = {int(k): v for k, v in _json.loads(labels_path.read_text(encoding='utf-8')).items()}
+        n_articles = to_wiki(G2, comms, str(out_dir / 'wiki'),
+                             community_labels=labels or None,
+                             cohesion=cohesion, god_nodes_data=gods)
+        print(f'[graphify hook] Wiki rebuilt: {n_articles} article(s) in {out_dir}/wiki/')
+except Exception as _wiki_exc:
+    print(f'[graphify hook] Wiki rebuild skipped: {_wiki_exc}')
+"""
+
+
+def _build_hook_script(*, with_wiki: bool = False) -> str:
+    """Build the post-commit hook body. Optionally inject a wiki rebuild step
+    after the AST rebuild (#549)."""
+    wiki_block = _WIKI_REBUILD_PYTHON if with_wiki else ""
+    return """\
 # graphify-hook-start
 # Auto-rebuilds the knowledge graph after each commit (code files only, no LLM needed).
-# Installed by: graphify hook install
+# Installed by: graphify hook install""" + (" --with-wiki" if with_wiki else "") + """
 
 # Skip during rebase/merge/cherry-pick to avoid blocking --continue with unstaged changes
 GIT_DIR=$(git rev-parse --git-dir 2>/dev/null)
@@ -87,12 +120,17 @@
 except Exception as exc:
     print(f'[graphify hook] Rebuild failed: {exc}')
     sys.exit(1)
+""" + wiki_block + """
 " > "$_GRAPHIFY_LOG" 2>&1 < /dev/null &
 disown 2>/dev/null || true
 # graphify-hook-end
 """
 
 
+# Backwards-compat: legacy callers and tests may still reference _HOOK_SCRIPT
+_HOOK_SCRIPT = _build_hook_script(with_wiki=False)
+
+
 _CHECKOUT_SCRIPT = """\
 # graphify-checkout-hook-start
 # Auto-rebuilds the knowledge graph (code only) when switching branches.
@@ -205,15 +243,23 @@ def _uninstall_hook(hooks_dir: Path, name: str, marker: str, marker_end: str) ->
     return f"graphify removed from {name} at {hook_path} (other hook content preserved)"
 
 
-def install(path: Path = Path(".")) -> str:
-    """Install graphify post-commit and post-checkout hooks in the nearest git repo."""
+def install(path: Path = Path("."), *, with_wiki: bool = False) -> str:
+    """Install graphify post-commit and post-checkout hooks in the nearest git repo.
+
+    Args:
+        with_wiki: If True, the post-commit hook also rebuilds the wiki
+            (graphify-out/wiki/) after the AST rebuild. Useful for users who
+            keep agent-crawlable docs in sync with code (#549). No LLM cost —
+            pure clustering + community-article generation.
+    """
     root = _git_root(path)
     if root is None:
         raise RuntimeError(f"No git repository found at or above {path.resolve()}")
 
     hooks_dir = _hooks_dir(root)
 
-    commit_msg = _install_hook(hooks_dir, "post-commit", _HOOK_SCRIPT, _HOOK_MARKER)
+    commit_script = _build_hook_script(with_wiki=with_wiki)
+    commit_msg = _install_hook(hooks_dir, "post-commit", commit_script, _HOOK_MARKER)
     checkout_msg = _install_hook(hooks_dir, "post-checkout", _CHECKOUT_SCRIPT, _CHECKOUT_MARKER)
 
     return f"post-commit: {commit_msg}\npost-checkout: {checkout_msg}"
diff --git a/tests/test_hooks.py b/tests/test_hooks.py
index 9d1260c3f..c00c2b384 100644
--- a/tests/test_hooks.py
+++ b/tests/test_hooks.py
@@ -142,3 +142,47 @@ def test_hook_check_no_additionalContext(tmp_path):
     assert result.returncode == 0
     assert result.stdout == ""
     assert result.stderr == ""
+
+
+def test_install_default_omits_wiki_rebuild(tmp_path):
+    """Without --with-wiki, the post-commit hook must not import or call to_wiki (#549)."""
+    repo = _make_git_repo(tmp_path)
+    install(repo)
+    hook_text = (repo / ".git" / "hooks" / "post-commit").read_text(encoding="utf-8")
+    assert "from graphify.wiki import to_wiki" not in hook_text
+    assert "Wiki rebuilt" not in hook_text
+
+
+def test_install_with_wiki_injects_wiki_rebuild(tmp_path):
+    """With with_wiki=True, the post-commit hook contains the wiki rebuild block (#549)."""
+    repo = _make_git_repo(tmp_path)
+    install(repo, with_wiki=True)
+    hook_text = (repo / ".git" / "hooks" / "post-commit").read_text(encoding="utf-8")
+    assert "from graphify.wiki import to_wiki" in hook_text
+    assert "Wiki rebuilt" in hook_text
+    # The hook should still rebuild the AST graph first - wiki is additive
+    assert "from graphify.watch import _rebuild_code" in hook_text
+    # And the install header should record the flag for later debugging
+    assert "--with-wiki" in hook_text
+
+
+def test_install_with_wiki_then_uninstall_clean(tmp_path):
+    """A --with-wiki install followed by uninstall must leave no graphify section behind."""
+    repo = _make_git_repo(tmp_path)
+    install(repo, with_wiki=True)
+    uninstall(repo)
+    hook = repo / ".git" / "hooks" / "post-commit"
+    if hook.exists():
+        text = hook.read_text(encoding="utf-8")
+        assert _HOOK_MARKER not in text
+        assert "from graphify.wiki import to_wiki" not in text
+
+
+def test_build_hook_script_wiki_block_only_when_requested():
+    """_build_hook_script(with_wiki=False) must produce identical script to legacy _HOOK_SCRIPT."""
+    from graphify.hooks import _build_hook_script, _HOOK_SCRIPT
+    assert _build_hook_script(with_wiki=False) == _HOOK_SCRIPT
+    # And with_wiki=True must be a strict superset (wiki block added)
+    with_wiki = _build_hook_script(with_wiki=True)
+    assert len(with_wiki) > len(_HOOK_SCRIPT)
+    assert "to_wiki" in with_wiki and "to_wiki" not in _HOOK_SCRIPT