diff --git a/README.md b/README.md
index 37b6226..4ed7b2c 100644
--- a/README.md
+++ b/README.md
@@ -2,24 +2,16 @@
 
 **@layered/dns-records** is a DNS helper library than can quickly discover and retrieve all DNS records for a domain.
 
-Uses Cloudflare or Google DNS, has a built-in list of subdomains to test for and support for auto-discovering more subdomains.
-
-→ See it in action here https://dmns.app
-
-## Highlights
 * Retrieves DNS records for a domain
 * Discovers (almost) all A, AAAA, CNAME, and TXT for a domain
 * Detects wildcard `*` records
 * Option to specify extra subdomains to check for
 * Provides results in common format, see `DnsRecord`
-* Works in all JavaScript runtimes: Browsers, NodeJS, CloudFlare Workers, Deno, Bun, etc
-
-## Getting Started
+* Works in all JavaScript runtimes: Browsers, Node.js, CloudFlare Workers, Deno, Bun, etc
 
-#### Requirements
+→ See it in action here https://dmns.app
 
-- `fetch` as a global
-- `dig` command for DNS lookups, if using `node-dig` resolver. https://linux.die.net/man/1/dig
+## Getting Started
 
 #### Installation
 
@@ -37,32 +29,45 @@ const txtRecords = await getDnsRecords('google.com', 'TXT')
 const allRecords = await getAllDnsRecords('x.com')
 ```
 
+## DNS Resolvers
+
+Here is the list of supported DNS resolvers:
+
+|Name|JS Runtime|Notes|
+|:--|:--|:--|
+|`cloudflare-dns`|Works on all|Requires `fetch` as global|
+|`google-dns`|Works on all|Requires `fetch` as global|
+|`node-dns`|Works only in Node.js|Uses [Node.js DNS module](https://nodejs.org/api/dns.html)|
+|`node-dig`|Works only in Node.js|Uses [`dig` command](https://www.ibm.com/docs/en/aix/7.3?topic=d-dig-command)|
+|`deno-dns`|Works only in Deno|Uses [Deno.resolveDns]([https://nodejs.org/api/dns.html](https://deno.land/api?s=Deno.resolveDns))|
+
 ## Client API
-- [`getDnsRecords(hostname: string, type: string = 'A', resolver = 'cloudflare-dns')`](#dns-records-by-type) - Get DNS records for a hostname
-- [`getAllDnsRecords(domain: string, options)`](#all-dns-records) - Get all DNS records for a domain
+- [`getDnsRecords(hostname: string, type: string = 'A', resolver?)`](#dns-records-by-type) - Get DNS records for a hostname
+- [`getAllDnsRecords(domain: string, options: GetAllDnsRecordsOptions)`](#all-dns-records) - Get all DNS records for a domain
 - [`getAllDnsRecordsStream(domain: string, options): ReadableStream`](#all-dns-records-stream)
 
 #### DNS Records by type
 
-`getDnsRecords(name: string, type: string = 'A', resolver = 'cloudflare-dns'): Promise<DnsRecord[]>`
+`getDnsRecords(name: string, type: string = 'A', resolver?): Promise<DnsRecord[]>`
 
 |Params|type|default|description|
 |-----|---|---|---|
 |name |string|   |hostname. Ex: `'x.com'` or `email.apple.com`|
 |type |string|`A`|record type: Ex: `'TXT'`, `'MX'`, `'CNAME'`|
-|resolver |string|`cloudflare-dns`|DNS resolver to use: `cloudflare-dns`, `google-dns`, `node-dig`|
-
+|resolver |string|   |DNS resolver to use, see resolvers above. If not set, the best match for current runtime will be used|
 
 ```js
 import { getDnsRecords } from '@layered/dns-records'
 
-const records1 = await getDnsRecords('google.com')
+const records1 = await getDnsRecords('google.com', 'A')
 console.log('DNS A records', records1)
 
 const records2 = await getDnsRecords('google.com', 'TXT')
 console.log('DNS TXT records', records2)
 ```
+
 Returns a promise which resolves with an `DnsRecord[]` of records found:
+
 ```js
 [ { name: 'google.com.',
     ttl: 608,
@@ -72,23 +77,25 @@ Returns a promise which resolves with an `DnsRecord[]` of records found:
 ]
 ```
 
-
 #### All DNS records
 
-`getAllDnsRecords(domain: string, options): Promise<DnsRecord[]>`
+`getAllDnsRecords(domain: string, options: GetAllDnsRecordsOptions): Promise<DnsRecord[]>`
 
-|Params|type|default|description|
-|-----|---|---|---|
-|domain|string|   |Valid domain name, ex: `'google.com'`|
-|options|object|   |   |
+|Params|type|description|
+|-----|---|---|
+|domain|string|Valid domain name, ex: `'google.com'`|
+|options|object|see `GetAllDnsRecordsOptions`|
 
 ```js
 import { getAllDnsRecords } from '@layered/dns-records'
 
-const allRecords = await getAllDnsRecords('x.com')
+const allRecords = await getAllDnsRecords('x.com', {
+  resolver: 'cloudflare-dns',
+  commonSubdomainsCheck: true,
+})
 console.log('DNS all records', allRecords)
 ```
-Returns a Promise which resolves with `DnsRecord[]` of records found:
+Returns a Promise which resolves with `DnsRecord[]` of all records found:
 ```js
 [ { name: 'x.com.', ttl: 3600, type: 'NS', data: 'ns71.domaincontrol.com.' },
   { name: 'x.com.', ttl: 3600, type: 'NS', data: 'ns72.domaincontrol.com.' },