more doc

git-svn-id: https://hudson.dev.java.net/svn/hudson/trunk/hudson/main@15284 71c3de6d-444a-0410-be80-ed276b4c234a

core/src/main/java/hudson/util/ProcessTreeKiller.java

@@ -94,6 +94,11 @@ public abstract class ProcessTreeKiller {
      *
      * <p>
      * The implementation is obviously OS-dependent.
+     *
+     * @param proc
+     *      Process to be killed recursively. Can be null.
+     * @param modelEnvVars
+     *      If non-null, search-and-destroy will be performed.
      */
     public abstract void kill(Process proc, Map<String, String> modelEnvVars);