diff --git a/content/en/docs/deployment/mendix-cloud-deploy/custom-domains.md b/content/en/docs/deployment/mendix-cloud-deploy/custom-domains.md
index d655a2e8ecb..34e1d073bee 100644
--- a/content/en/docs/deployment/mendix-cloud-deploy/custom-domains.md
+++ b/content/en/docs/deployment/mendix-cloud-deploy/custom-domains.md
@@ -100,6 +100,12 @@ For application-level certificates, you need to [upload](/developerportal/deploy
 
 For central certificates, a single certificate managed by the Mendix Admin can be reused across multiple custom domains and applications, if applicable.
 
+### Which Certificates and TLS Cipher Suites Does Mendix Cloud Support? {#supported-certificates}
+
+Mendix Cloud currently supports only RSA certificates. The default `*.mendixcloud.com` domains use an RSA certificate, and you can only upload RSA certificates for custom domains. The `TLS_ECDHE_ECDSA_*` cipher suites are enabled in the Mendix Cloud Transport Layer Security (TLS) configuration. However, a server can only negotiate them when it presents an Elliptic Curve Digital Signature Algorithm (ECDSA) certificate. As a result, these cipher suites cannot be used yet.
+
+With an RSA certificate, the TLS 1.2 cipher suites that work are the `TLS_ECDHE_RSA_*` suites, such as `TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256` and `TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384`.
+
 ## Read More
 
 * [Certificate Management](/control-center/certificate-management/)
diff --git a/content/en/docs/releasenotes/deployment/mendix-cloud/2025.md b/content/en/docs/releasenotes/deployment/mendix-cloud/2025.md
index 8dcef15e714..266d31a5f1f 100644
--- a/content/en/docs/releasenotes/deployment/mendix-cloud/2025.md
+++ b/content/en/docs/releasenotes/deployment/mendix-cloud/2025.md
@@ -117,6 +117,8 @@ We will also introduce new, recommended SSL/TLS ciphers. These additions will fi
 * `TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256`
 * `TLS_ECDHE_PSK_WITH_CHACHA20_POLY1305_SHA256`
 
+The `TLS_ECDHE_ECDSA_*` cipher suites require an ECDSA certificate, which Mendix Cloud doesn't currently support. For details, refer to the [Which Certificates and TLS Cipher Suites Does Mendix Cloud Support?](/developerportal/deploy/custom-domains/#supported-certificates) section in *Custom Domains*.
+
 ## September 2025
 
 ### September 21, 2025