diff --git a/CONTRIBUTING.md b/CONTRIBUTING.md
index 9939a5ab..464310e2 100644
--- a/CONTRIBUTING.md
+++ b/CONTRIBUTING.md
@@ -30,3 +30,49 @@ a lot of time on something the project's developers might not want to merge into
 
 **IMPORTANT**: By submitting a patch, you agree to allow the project
 owners to license your work under the terms of the [MIT License](LICENSE).
+
+## DNS Providers: API references
+
+| DNS provider              | Code           | Documentation                                                                                                | Go client                                                         |
+|---------------------------|----------------|--------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------|
+| Acme DNS                  | `acmedns`      | [documentation](https://github.com/joohoi/acme-dns#api)                                                      | [Go client](https://github.com/joohoi/acme-dns)                   |
+| Alibaba Cloud             | `alidns`       | [documentation](https://www.alibabacloud.com/help/doc-detail/42875.htm)                                      | [Go client](https://github.com/aliyun/alibaba-cloud-sdk-go)       |
+| Aurora DNS                | `auroradns`    | ?                                                                                                            | [Go client](https://github.com/edeckers/auroradnsclient)          |
+| Azure                     | `azure`        | [documentation](https://docs.microsoft.com/en-us/go/azure/)                                                  | [Go client](https://github.com/Azure/azure-sdk-for-go)            |
+| Bluecat                   | `bluecat`      | ?                                                                                                            | -                                                                 |
+| Cloudflare                | `cloudflare`   | [documentation](https://api.cloudflare.com/)                                                                 | [Go client](https://github.com/cloudflare/cloudflare-go)          |
+| CloudXNS                  | `cloudxns`     | [documentation](https://www.cloudxns.net/Public/Doc/CloudXNS_api2.0_doc_zh-cn.zip)                           | -                                                                 |
+| Digital Ocean             | `digitalocean` | [documentation](https://developers.digitalocean.com/documentation/v2/#domain-records)                        | -                                                                 |
+| DNSimple                  | `dnsimple`     | [documentation](https://developer.dnsimple.com/v2/)                                                          | [Go client](https://github.com/dnsimple/dnsimple-go)              |
+| DNS Made Easy             | `dnsmadeeasy`  | [documentation](https://api-docs.dnsmadeeasy.com/)                                                           | -                                                                 |
+| DNSPod                    | `dnspod`       | [documentation](https://www.dnspod.cn/docs/index.html)                                                       | [Go client](https://github.com/decker502/dnspod-go)               |
+| Duck DNS                  | `duckdns`      | [documentation](https://www.duckdns.org/spec.jsp)                                                            | -                                                                 |
+| Dyn                       | `dyn`          | [documentation](https://help.dyn.com/rest/)                                                                  | -                                                                 |
+| exec                      | `exec`         | -                                                                                                            | -                                                                 |
+| Exoscale                  | `exoscale`     | [documentation](https://community.exoscale.com/documentation/dns/api/)                                       | [Go client](https://github.com/exoscale/egoscale)                 |
+| FastDNS                   | `fastdns`      | [documentation](https://developer.akamai.com/api/web_performance/fast_dns_record_management/v1.html)         | [Go client](https://github.com/akamai/AkamaiOPEN-edgegrid-golang) |
+| Gandi                     | `gandi`        | [documentation](http://doc.rpc.gandi.net/index.html)                                                         | -                                                                 |
+| Gandi v5                  | `gandiv5`      | [documentation](http://doc.livedns.gandi.net)                                                                | -                                                                 |
+| Google Cloud              | `gcloud`       | ?                                                                                                            | [Go client](https://github.com/googleapis/google-api-go-client)   |
+| Glesys                    | `glesys`       | [documentation](https://github.com/GleSYS/API/wiki/API-Documentation)                                        | -                                                                 |
+| Go Daddy                  | `godaddy`      | [documentation](https://developer.godaddy.com/doc/endpoint/domains)                                          | -                                                                 |
+| hosting.de                | `hostingde`    | [documentation](https://www.hosting.de/api/#dns)                                                             | -                                                                 |
+| Internet Initiative Japan | `iij`          | [documentation](http://manual.iij.jp/p2/pubapi/)                                                             | [Go client](https://github.com/iij/doapi)                         |
+| Lightsail                 | `lightsail`    | ?                                                                                                            | [Go client](https://github.com/aws/aws-sdk-go/aws)                |
+| Linode (deprecated)       | `linode`       | [documentation](https://www.linode.com/api/dns)                                                              | [Go client](https://github.com/timewasted/linode)                 |
+| Linodev4                  | `linodev4`     | [documentation](https://developers.linode.com/api/v4)                                                        | [Go client](https://github.com/linode/linodego)                   |
+| Namecheap                 | `namecheap`    | [documentation](https://www.namecheap.com/support/api/methods.aspx)                                          | -                                                                 |
+| Name.com                  | `namedotcom`   | [documentation](https://www.name.com/api-docs/DNS)                                                           | [Go client](https://github.com/namedotcom/go)                     |
+| manual                    | `manual`       | -                                                                                                            | -                                                                 |
+| Netcup                    | `netcup`       | [documentation](https://www.netcup-wiki.de/wiki/DNS_API)                                                     | -                                                                 |
+| NIFCloud                  | `nifcloud`     | [documentation](https://mbaas.nifcloud.com/doc/current/rest/common/format.html)                              | -                                                                 |
+| NS1                       | `ns1`          | [documentation](https://ns1.com/api)                                                                         | [Go client](https://github.com/ns1/ns1-go)                        |
+| Open Telekom Cloud        | `otc`          | [documentation](https://docs.otc.t-systems.com/en-us/dns/index.html)                                         | -                                                                 |
+| OVH                       | `ovh`          | [documentation](https://eu.api.ovh.com/)                                                                     | [Go client](https://github.com/ovh/go-ovh)                        |
+| PowerDNS                  | `pdns`         | [documentation](https://doc.powerdns.com/md/httpapi/README/)                                                 | -                                                                 |
+| Rackspace                 | `rackspace`    | [documentation](https://developer.rackspace.com/docs/cloud-dns/v1/)                                          | -                                                                 |
+| RFC2136                   | `rfc2136`      | [documentation](https://tools.ietf.org/html/rfc2136)                                                         | -                                                                 |
+| Route 53                  | `route53`      | [documentation](https://docs.aws.amazon.com/Route53/latest/APIReference/API_Operations_Amazon_Route_53.html) | [Go client](https://github.com/aws/aws-sdk-go/aws)                |
+| Sakura Cloud              | `sakuracloud`  | [documentation](https://developer.sakura.ad.jp/cloud/api/1.1/)                                               | [Go client](https://github.com/sacloud/libsacloud)                |
+| VegaDNS                   | `vegadns`      | [documentation](https://github.com/shupp/VegaDNS-API)                                                        | [Go client](https://github.com/OpenDNS/vegadns2client)            |
+| Vultr                     | `vultr`        | [documentation](https://www.vultr.com/api/#dns)                                                              | [Go client](https://github.com/JamesClonk/vultr)                  |