Consider documenting the "required" support for message digest algorithms for RSASSA-PSS signature in "Java Security Standard Algorithm Names" doc, e.g. https://docs.oracle.com/en/java/javase/14/docs/specs/security/standard-names.html. RSASSA-PSS is not a required signature algorithm for Java SE, but it'd help promote interoperability to define the list of required message digest algorithm support for providers who support RSASSA-PSS.

In addition, it may be useful to include the supported message digest algorithms for the RSASSA-PSS signature impl in SunRsaSign provider in the "JDK providers" doc, e.g. https://docs.oracle.com/en/java/javase/14/security/oracle-providers.html#GUID-17E3589E-E4BA-4881-9B12-9880DD2D128D