diff --git a/openapi/calle.openapi.yaml b/openapi/calle.openapi.yaml
index 3475d52..938e9d7 100644
--- a/openapi/calle.openapi.yaml
+++ b/openapi/calle.openapi.yaml
@@ -1163,6 +1163,8 @@ components:
 
             This is useful for batch calls where each recipient needs their own outcome, such as `can_attend`, `confirmed`, `requested_callback`, or `interest_level`.
 
+            Supported schema features are `type`, `properties`, `required`, `enum`, nested `object` fields, simple `array.items`, `description`, and `additionalProperties: false`. Unsupported features include `$ref`, `oneOf`, `anyOf`, `allOf`, recursive schemas, complex format validation, and `additionalProperties: true`.
+
             Do not use reserved recipient response field names such as `summary`, `status`, `transcript`, `call_id`, or timing fields as custom result fields. Use names such as `customer_summary`, `notes`, or `reason` instead.
 
             Field `description` values are passed to the extraction model and should explain how enum values should be selected. Descriptions guide extraction but are not hard validation rules. Hard validation comes from `type`, `required`, `enum`, and `additionalProperties`.
diff --git a/src/regions.mjs b/src/regions.mjs
index 8e3a050..f19d658 100644
--- a/src/regions.mjs
+++ b/src/regions.mjs
@@ -17,8 +17,7 @@ export function extractRegions(readme) {
     !section ||
     !rows ||
     rows.length < 3 ||
-    rows[0] !==
-      "| Country | Country Code | Calling Code | Languages | Default Line |" ||
+    !/^\| Country \| Country Code \| Calling Code \| Languages \| (?:Default Line|Line Region) \|$/.test(rows[0]) ||
     !/^\|(?:[ \t]*:?-+:?[ \t]*\|){5}$/.test(rows[1]) ||
     rows.some((row) => row.split("|").length !== 7) ||
     rows.slice(2).some((row) =>
diff --git a/tests/docs-site.spec.ts b/tests/docs-site.spec.ts
index d7d7c9e..55d0af3 100644
--- a/tests/docs-site.spec.ts
+++ b/tests/docs-site.spec.ts
@@ -75,6 +75,8 @@ Unrelated examples.`;
 test("extracts only valid region coverage from the source README", () => {
   expect(extractRegions(regionsReadme)).toBe(regionSection);
   expect(extractRegions(regionsReadme.replaceAll("\n", "\r\n"))).toBe(regionSection);
+  expect(extractRegions(regionsReadme.replace("Default Line", "Line Region")))
+    .toBe(regionSection.replace("Default Line", "Line Region"));
   for (const invalid of [
     regionsReadme.replace("Supported Regions and Languages", "Removed section"),
     regionsReadme.replace("| Languages |", "| Renamed column |"),
@@ -100,6 +102,13 @@ test("refreshes region coverage without rebuilding the docs", async ({ page }) =
   await expect(page.getByRole("cell", { name: "Test language" })).toBeVisible();
   await expect(page.getByText("Unrelated examples.")).toHaveCount(0);
 
+  await page.route(REGIONS_README_URL, (route) => route.fulfill({
+    contentType: "text/plain",
+    body: regionsReadme.replace("Default Line", "Line Region"),
+  }));
+  await page.reload();
+  await expect(page.getByRole("columnheader", { name: "Line Region" })).toBeVisible();
+
   await page.setViewportSize({ width: 390, height: 844 });
   expect(await page.evaluate(() => document.documentElement.scrollWidth)).toBeLessThanOrEqual(390);
   await page.setViewportSize({ width: 1280, height: 720 });
@@ -113,13 +122,13 @@ test("refreshes region coverage without rebuilding the docs", async ({ page }) =
 
 test("retains a readable region snapshot when refresh fails", async ({ page, request }) => {
   await page.setViewportSize({ width: 390, height: 844 });
-  const tableHeader = "| Country | Country Code | Calling Code | Languages | Default Line |";
+  const tableHeader = /\| Country \| Country Code \| Calling Code \| Languages \| (?:Default Line|Line Region) \|/;
   const html = await request.get("/regions");
   expect(await html.text()).toContain("<table");
   const markdown = await request.get("/regions.md");
-  expect(await markdown.text()).toContain(tableHeader);
+  expect(await markdown.text()).toMatch(tableHeader);
   const llmsFull = await request.get("/llms-full.txt");
-  expect(await llmsFull.text()).toContain(tableHeader);
+  expect(await llmsFull.text()).toMatch(tableHeader);
 
   for (const response of [
     { status: 503, body: "Unavailable" },