readme: document source of sgx root ca

Signed-off-by: Jiaqi Gao <[email protected]>
intel · Aug 9, 2023 · 354f622 · 354f622
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diff --git a/readme.md b/readme.md
@@ -89,6 +89,7 @@ To specify the root certificate to be enrolled, you can use the `--root-ca` argu
 ```
 cargo image --root-ca /path/to/cert
 ```
+Note: SGX SBX Root CA can be downloaded at https://sbx-certificates.trustedservices.intel.com/Intel_SGX_Provisioning_Certification_RootCA.cer
 
 To specify the policy file to be enrolled, you can use the `--policy` argument:
 ```