src/java.base/share/classes/java/net/StandardProtocolFamily.java

*** 39,7 ***
      INET,
  
      /**
       * Internet Protocol Version 6 (IPv6)
       */
!     INET6
  }
--- 39,13 ---
      INET,
  
      /**
       * Internet Protocol Version 6 (IPv6)
       */
!     INET6,
+ 
+     /**
+      * Unix domain (Local) interprocess communication.
+      * @since 16
+      */
+     UNIX
  }