diff --git a/CHANGELOG.md b/CHANGELOG.md
index 5230666..c13e7d2 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -22,6 +22,20 @@ always means the deployed record rescored against the new methodology, which
 is an operation, not a side effect — say so here so the pin bump that carries
 it is deliberate.
 
+## [0.13.0] — 2026-08-28
+
+### Changed
+- `guide/` and `guides/` top-level directories now count as documentation
+  directories (`has_docs_dir`), alongside `doc/`, `docs/`, `documentation/`
+  and `wiki/`. `guide/` is the established mdBook convention in the Rust
+  ecosystem; wasm-bindgen's maintainer reported scoring 0 on the criterion
+  despite a full guide in the repository (issue #11).
+
+**Downstream impact:** pin bump only — no new report field, no detail codes,
+no `METRICS_VERSION` change. The formula is unchanged; the collected signal
+widens, so affected repositories pick up the points at their next rescan.
+No rescore of the record: stored reports keep their collected signals.
+
 ## [0.12.0] — 2026-08-27
 
 ### Changed
diff --git a/docs/report-schema.md b/docs/report-schema.md
index b33b214..3411a7e 100644
--- a/docs/report-schema.md
+++ b/docs/report-schema.md
@@ -427,7 +427,7 @@ safe direction to fail for a figure that is descriptive only.
 | ----- | --------- |
 | `has_ci`, `ci_workflows` | `.github/workflows/*.yml\|yaml` |
 | `has_tests` | `test(s)`/`spec(s)`/`__tests__` directories or test-file naming patterns |
-| `has_docs_dir` | Non-empty `doc/`, `docs/`, `documentation/`, or `wiki/` directory |
+| `has_docs_dir` | Non-empty `doc/`, `docs/`, `documentation/`, `wiki/`, `guide/`, or `guides/` directory |
 | `has_linter_config`, `linter_configs` | Known linter config files (ruff, flake8, eslint, golangci, …) |
 | `has_editorconfig`, `has_precommit_config` | `.editorconfig`, `.pre-commit-config.yaml` |
 
diff --git a/pyproject.toml b/pyproject.toml
index 881478c..0369ad2 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "inspect-scanner"
-version = "0.12.0"
+version = "0.13.0"
 description = "CLI scanner that audits public GitHub repositories and produces JSON reports"
 readme = "README.md"
 requires-python = ">=3.11"
diff --git a/src/scanner/__init__.py b/src/scanner/__init__.py
index 0622cbd..21d8fd9 100644
--- a/src/scanner/__init__.py
+++ b/src/scanner/__init__.py
@@ -3,4 +3,4 @@
 from .models import Report
 
 __all__ = ["Report"]
-__version__ = "0.12.0"
+__version__ = "0.13.0"
diff --git a/src/scanner/collect.py b/src/scanner/collect.py
index dc1230d..f2d6481 100644
--- a/src/scanner/collect.py
+++ b/src/scanner/collect.py
@@ -156,7 +156,7 @@ class TreeEntry(NamedTuple):
 }
 
 TEST_DIR_NAMES = {"test", "tests", "spec", "specs", "__tests__", "testing"}
-DOC_DIR_NAMES = {"doc", "docs", "documentation", "wiki"}
+DOC_DIR_NAMES = {"doc", "docs", "documentation", "wiki", "guide", "guides"}
 TEST_FILE_PATTERNS = ("test_*.py", "*_test.py", "*_test.go", "*.test.js", "*.test.ts", "*.spec.js", "*.spec.ts", "*Test.java", "*Test.php")
 
 # --- AI readiness signal detection ----------------------------------------
diff --git a/tests/test_signals.py b/tests/test_signals.py
index 476630b..1ecda08 100644
--- a/tests/test_signals.py
+++ b/tests/test_signals.py
@@ -83,7 +83,8 @@ def test_no_embedded_config_leaves_signals_unchanged():
 
 
 def test_docs_dir_aliases():
-    for directory in ("doc", "docs", "documentation", "wiki"):
+    # guide/guides: mdBook convention (wasm-bindgen PR #5291 feedback, issue #11).
+    for directory in ("doc", "docs", "documentation", "wiki", "guide", "guides"):
         assert _quality([f"{directory}/index.md"]).has_docs_dir, directory
     # A file named like a docs dir, or a bare top-level file, is not a docs dir.
     assert not _quality(["documentation.md"]).has_docs_dir