diff --git a/CHANGELOG.md b/CHANGELOG.md
index a05ff1a..e2be309 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -3,6 +3,14 @@
 All notable changes to okf-kit are documented here. This project adheres to
 [Semantic Versioning](https://semver.org/).
 
+## 0.3.1 — 2026-07-09
+
+### Added
+- **`GET /api/books/{name}/toc` now includes each concept's `resource`** (its
+  original page URL). This lets a GUI reader map an in-bundle link to the concept
+  it points at and navigate in-app, instead of opening the browser for links to
+  pages that are already in the bundle.
+
 ## 0.3.0 — 2026-07-08
 
 ### Added
@@ -189,6 +197,7 @@ okf chat docs-okf --provider ollama              # chat offline, no key
   Install `[js]` in its own environment for now. Tracked in
   [#6](https://github.com/vinodborole/okf-kit/issues/6), fix planned for 0.1.1.
 
+[0.3.1]: https://github.com/vinodborole/okf-kit/releases/tag/v0.3.1
 [0.3.0]: https://github.com/vinodborole/okf-kit/releases/tag/v0.3.0
 [0.2.0]: https://github.com/vinodborole/okf-kit/releases/tag/v0.2.0
 [0.1.8]: https://github.com/vinodborole/okf-kit/releases/tag/v0.1.8
diff --git a/okf_kit/__init__.py b/okf_kit/__init__.py
index 386f190..88e4304 100644
--- a/okf_kit/__init__.py
+++ b/okf_kit/__init__.py
@@ -1,3 +1,3 @@
 """okf-kit — turn any website into a portable, agent-ready OKF bundle."""
 
-__version__ = "0.3.0"
+__version__ = "0.3.1"
diff --git a/okf_kit/serve/reader.py b/okf_kit/serve/reader.py
index 4bb8715..c4dbd0b 100644
--- a/okf_kit/serve/reader.py
+++ b/okf_kit/serve/reader.py
@@ -33,7 +33,11 @@ def ordered_concepts(bundle_dir) -> list[dict]:
     for p in files:
         cid = p.relative_to(root).as_posix()[:-3]
         fm, _ = _split_frontmatter(p.read_text(encoding="utf8"))
-        out.append({"id": cid, "title": fm.get("title") or cid.split("/")[-1]})
+        out.append({
+            "id": cid,
+            "title": fm.get("title") or cid.split("/")[-1],
+            "resource": fm.get("resource") or "",  # original page URL — lets a GUI
+        })                                          # map in-bundle links to concepts
     return out
 
 
@@ -51,7 +55,8 @@ def to_list(node: dict) -> list[dict]:
         items = []
         for (kind, name), val in node.items():
             if kind == "file":
-                items.append({"kind": "concept", "id": val["id"], "title": val["title"]})
+                items.append({"kind": "concept", "id": val["id"], "title": val["title"],
+                              "resource": val.get("resource", "")})
             else:
                 items.append({"kind": "section", "title": _prettify(name), "children": to_list(val)})
         return items
diff --git a/pyproject.toml b/pyproject.toml
index f72ee37..1895b10 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "okf-kit"
-version = "0.3.0"
+version = "0.3.1"
 description = "Turn any website into a portable, agent-ready Open Knowledge Format (OKF) bundle — build, sync, and chat, no LLM required to start."
 readme = "README.md"
 requires-python = ">=3.10"
diff --git a/tests/test_serve.py b/tests/test_serve.py
index 73d120c..51d2416 100644
--- a/tests/test_serve.py
+++ b/tests/test_serve.py
@@ -34,8 +34,8 @@ def client(tmp_path, monkeypatch):
         "---\ntype: Web Page\ntitle: Introduction\n---\n# Introduction\n\nWelcome.\n", encoding="utf8"
     )
     (b / "pages" / "ownership.md").write_text(
-        "---\ntype: Web Page\ntitle: Ownership\n---\n# Ownership\n\n"
-        "## Borrowing\n\nOwnership means every value has exactly one owner.\n",
+        "---\ntype: Web Page\ntitle: Ownership\nresource: https://doc.rust-lang.org/book/ch04-01.html\n---\n"
+        "# Ownership\n\n## Borrowing\n\nOwnership means every value has exactly one owner.\n",
         encoding="utf8",
     )
     (b / ".okf-kit").mkdir()
@@ -72,6 +72,9 @@ def test_toc_and_concept(client):
     toc = client.get("/api/books/testbook/toc", headers=AUTH).json()
     ids = _concept_ids(toc)
     assert "pages/intro" in ids and "pages/ownership" in ids
+    # toc carries each concept's original URL so a GUI can map links → concepts
+    own = _find_concept(toc, "pages/ownership")
+    assert own["resource"] == "https://doc.rust-lang.org/book/ch04-01.html"
 
     c = client.get("/api/books/testbook/concept", params={"id": "pages/ownership"}, headers=AUTH).json()
     assert c["title"] == "Ownership"
@@ -125,6 +128,17 @@ def _concept_ids(nodes):
     return out
 
 
+def _find_concept(nodes, cid):
+    for n in nodes:
+        if n["kind"] == "concept" and n["id"] == cid:
+            return n
+        if n["kind"] == "section":
+            found = _find_concept(n["children"], cid)
+            if found:
+                return found
+    return None
+
+
 def _parse_sse(text):
     events = []
     for block in text.strip().split("\n\n"):