--- a/src/java.base/share/classes/java/net/StandardProtocolFamily.java	Fri Oct 25 14:50:16 2019 +0100
+++ b/src/java.base/share/classes/java/net/StandardProtocolFamily.java	Fri Oct 25 15:56:35 2019 +0100
@@ -41,5 +41,10 @@
     /**
      * Internet Protocol Version 6 (IPv6)
      */
-    INET6
+    INET6,
+
+    /**
+     * Unix domain (AF_UNIX)
+     */
+    UNIX
 }