Document lib-name suffix format used by official clients

commands/client-setinfo.md

@@ -7,7 +7,13 @@ Currently the supported attributes are:
 * `lib-name` - meant to hold the name of the client library that's in use.
 * `lib-ver` - meant to hold the client library's version.
 
-There is no limit to the length of these attributes. However it is not possible to use spaces, newlines, or other non-printable characters that would violate the format of the `CLIENT LIST` reply.
+There is no limit to the length of these attributes. However, it is not possible to use spaces, newlines, or other non-printable characters that would violate the format of the `CLIENT LIST` reply.
+
+[Official client libraries](https://redis.io/docs/clients/) allow extending `lib-name` with a custom suffix to expose additional information about the client. 
+For example, high-level libraries like [redis-om-spring](https://github.com/redis/redis-om-spring) can report their version. 
+The resulting `lib-name` would be `jedis(redis-om-spring_v1.0.0)`. 
+Brace characters are used to delimit the custom suffix and should be avoided in the suffix itself.
+We recommend using the following format for the custom suffixes for third-party libraries `(?<custom-name>[ -~]+)[ -~]v(?<custom-version>[\d\.]+)` and use `;` to delimit multiple suffixes.
 
 Note that these attributes are **not** cleared by the RESET command.