diff --git a/README.md b/README.md
index a011c52..d80dcb6 100644
--- a/README.md
+++ b/README.md
@@ -53,7 +53,7 @@ assessed. Reports use the `@extant2000/evidence-record` format.
 
 ```ts
 import { assertShape, expectFields, assertFields, formatFields, coverage, formatCoverage } from '@extant2000/contract-check'
-import { z } from 'zod'   // or any parser with a zod-style safeParse
+import { z } from 'zod'   // npm install zod, or use any parser with a zod-style safeParse
 
 // 1. Response shape
 const payload: unknown = { id: 'm1', name: 'Survey' }   // e.g. a parsed response body
@@ -68,7 +68,7 @@ const expectations = [
 ]
 const result = expectFields(subscription, expectations)
 console.log(formatFields(result, { context: 'stripe.subscriptions.create', expectations }))
-assertFields(subscription, expectations, 'stripe.subscriptions.create')   // or throw
+// assertFields(subscription, expectations, 'stripe.subscriptions.create')   // throws ContractDriftError here instead
 
 // 3. Coverage against a floor
 const c = coverage(['GET /a', 'GET /b', 'POST /c', 'GET /d'], ['GET /a', 'GET /b', 'POST /c'], 80)