-EVP_DigesVerify() is a single part operation which verifies a single block of
-data in one function. It is equivalent to calling EVP_DigestVerifyUpdate() and
-EVP_DigestVerifyFinal().
+EVP_DigestVerify() is a one shot operation which verifies a single block of
+data in one function. For algorithms that support streaming it is equivalent
+to calling EVP_DigestVerifyUpdate() and EVP_DigestVerifyFinal(). For
+algorithms which do not support streaming (e.g. PureEdDSA) it is the only way
+to verify data.