diff --git a/README.md b/README.md
index e8b64df..00bedfa 100644
--- a/README.md
+++ b/README.md
@@ -231,9 +231,11 @@ The legacy `402` with `code: "AUTH010"` means the domain isn't enabled. `extract
 
 #### Preparing a domain
 
-`client.prepareDomain(domain, exampleUrls)` submits a domain for Extract (`POST /v1/extract/prepared-domains`), and `client.preparedDomainStatus(domain)` reads where it is (`GET /v1/extract/prepared-domains/{domain}`). Both resolve to the parsed status object. Pass the domain without a scheme and 1 to 5 example URLs, one per kind of page you want to extract. These calls cost no credits.
+`client.prepareDomain(domain, exampleUrls)` submits a domain for Extract (`POST /v1/extract/prepared-domains`), and `client.preparedDomainStatus(domain)` reads where it is (`GET /v1/extract/prepared-domains/{domain}`). Both resolve to the parsed status object. Pass the domain without a scheme and 1 to 5 example URLs on that domain. These calls cost no credits.
 
-Preparation takes minutes, and the client does not wait for it. Poll the status until it is no longer `"preparing"`:
+One example URL works; we recommend 3 or more of the same page type (e.g. 3 product pages), because Extract compares pages of one type to check the fields it found and fill in fields one page is missing. Several page types can share the 5 (e.g. 3 product pages + 2 search-result pages).
+
+Preparation takes minutes, and the client does not wait for it. Poll the status until it is no longer `"preparing"`. This example prepares three product pages:
 
 ```javascript
 import { ZenRows, ZenRowsPreparedDomainError } from "zenrows";
@@ -242,7 +244,9 @@ const client = new ZenRows("YOUR-API-KEY");
 
 try {
   let status = await client.prepareDomain("www.scrapingcourse.com", [
-    "https://www.scrapingcourse.com/ecommerce/",
+    "https://www.scrapingcourse.com/ecommerce/product/abominable-hoodie/",
+    "https://www.scrapingcourse.com/ecommerce/product/adrienne-trek-jacket/",
+    "https://www.scrapingcourse.com/ecommerce/product/aeon-capri/",
   ]);
   while (status.status === "preparing") {
     await new Promise((resolve) => setTimeout(resolve, 30_000));
diff --git a/src/index.ts b/src/index.ts
index 516ce8f..64c8498 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -230,9 +230,12 @@ export class ZenRows {
    * the parsed status object the API answers with `202`: `domain`, `status` (`"preparing"`,
    * `"ready"` or `"failed"`), `state`, `submitted_at`, `updated_at`.
    *
-   * `domain` is the domain without a scheme. `exampleUrls` are 1 to 5 URLs on that domain,
-   * one per kind of page you want to extract. Submitting a domain that is already prepared
-   * returns its current status instead of starting a new run.
+   * `domain` is the domain without a scheme. `exampleUrls` are 1 to 5 example URLs on that
+   * domain. One works; we recommend 3 or more of the same page type (e.g. 3 product pages),
+   * because Extract compares pages of one type to check the fields it found and fill in fields
+   * one page is missing. Several page types can share the 5 (e.g. 3 product pages + 2
+   * search-result pages). Submitting a domain that is already prepared returns its current
+   * status instead of starting a new run.
    *
    * Preparation takes minutes. This method does not wait for it: call
    * `preparedDomainStatus(domain)` until `status` is no longer `"preparing"`. These endpoints