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--- a/docs/reference/plugins/validation/index.md
+++ b/docs/reference/plugins/validation/index.md
@@ -6,14 +6,15 @@ sidebar: reference
A validation plugin is responsible for providing the ACME server with proof that you own the identifiers
(host names) that you want to create a certificate for. The
-[ACMEv2 protocol](https://tools.ietf.org/html/draft-ietf-acme-acme-18) defines different challenge types,
-two whom are supported by Let's Encrypt and win-acme, namely [HTTP-01](/win-acme/reference/plugins/validation/http/),
+[ACMEv2 protocol](https://tools.ietf.org/html/draft-ietf-acme-acme-18) defines different
+challenge types, three of which are supported by win-acme, namely
+[HTTP-01](/win-acme/reference/plugins/validation/http/),
[DNS-01](/win-acme/reference/plugins/validation/dns/) and
[TLS-ALPN-01](/win-acme/reference/plugins/validation/tls-alpn/).
-For wildcard identifiers, only DNS validation is accepted by Let's Encrypt.
+For wildcard identifiers, only DNS-01 validation is accepted by Let's Encrypt.
-Other challenge types are not supported for various reasons:
+Several other challenge types are not supported for various reasons:
- `TLS-SNI-01/-02` - deprecated and removed
- `PROOFOFPOSSESSION-01` - unknown