Probably obsolete comment.

core/src/main/java/hudson/security/ACL.java

@@ -107,11 +107,6 @@ public abstract class ACL {
      * <p>
      * This is used when Hudson is performing computation for itself, instead
      * of acting on behalf of an user, such as doing builds.
-     *
-     * <p>
-     * (Note that one of the features being considered is to keep track of who triggered
-     * a build &mdash; so in a future, perhaps {@link Executor} will run on behalf of
-     * the user who triggered a build.)
      */
     public static final Authentication SYSTEM = new UsernamePasswordAuthenticationToken("SYSTEM","SYSTEM");