diff --git a/README.md b/README.md
index 0788a32..884b708 100644
--- a/README.md
+++ b/README.md
@@ -24,7 +24,7 @@ specification.
 
 ## Limitations
 
-* Only tested with DNS challenges against Let's Encrypt so far (staging and production)
+* Only tested with DNS challenges against Let's Encrypt (staging and production) and ZeroSSL (production) so far 
 * Only supports ECDSA keys for now
 
 ## Getting started
diff --git a/src/lib.rs b/src/lib.rs
index a5bf8d6..4910066 100644
--- a/src/lib.rs
+++ b/src/lib.rs
@@ -24,7 +24,7 @@ use serde::Serialize;
 mod types;
 pub use types::{
     AccountCredentials, Authorization, AuthorizationStatus, Challenge, ChallengeType, Error,
-    Identifier, LetsEncrypt, NewAccount, NewOrder, OrderState, OrderStatus, Problem,
+    Identifier, LetsEncrypt, NewAccount, NewOrder, OrderState, OrderStatus, Problem, ZeroSsl,
 };
 use types::{
     DirectoryUrls, Empty, FinalizeRequest, Header, JoseJson, Jwk, KeyOrKeyId, NewAccountPayload,
diff --git a/src/types.rs b/src/types.rs
index e19f94b..3d09b20 100644
--- a/src/types.rs
+++ b/src/types.rs
@@ -428,6 +428,22 @@ impl LetsEncrypt {
     }
 }
 
+/// ZeroSSL ACME only supports production at the moment
+#[allow(missing_docs)]
+#[derive(Clone, Copy, Debug)]
+pub enum ZeroSsl {
+    Production,
+}
+
+impl ZeroSsl {
+    /// Get the directory URL for the given ZeroSSL server
+    pub const fn url(&self) -> &'static str {
+        match self {
+            Self::Production => "https://acme.zerossl.com/v2/DV90",
+        }
+    }
+}
+
 #[derive(Clone, Copy, Debug, Serialize)]
 #[serde(rename_all = "UPPERCASE")]
 pub(crate) enum SigningAlgorithm {