diff --git a/versioned_docs/version-3.15/scalar-kubernetes/HowToCreateKeyAndCertificateFiles.mdx b/versioned_docs/version-3.15/scalar-kubernetes/HowToCreateKeyAndCertificateFiles.mdx
index 76ad97a1..0aa0147c 100644
--- a/versioned_docs/version-3.15/scalar-kubernetes/HowToCreateKeyAndCertificateFiles.mdx
+++ b/versioned_docs/version-3.15/scalar-kubernetes/HowToCreateKeyAndCertificateFiles.mdx
@@ -12,6 +12,7 @@ This guide explains how to create private key and certificate files for TLS conn
 ## Certificate requirements
 
 * You can use only `RSA` or `ECDSA` as an algorithm for private key and certificate files.
+* For ScalarDB Analytics server, you must use `PKCS #8` as the private key format based on the default setting of gRPC.
 
 ## Example steps to create sample private key and certificate files