Add a bit of javadoc

git-svn-id: https://svn.apache.org/repos/asf/felix/trunk@1736005 13f79535-47bb-0310-9956-ffa450edef68
diff --git a/gogo/runtime/src/main/java/org/apache/felix/service/command/CommandSession.java b/gogo/runtime/src/main/java/org/apache/felix/service/command/CommandSession.java
index 71e5ddc..6794781 100644
--- a/gogo/runtime/src/main/java/org/apache/felix/service/command/CommandSession.java
+++ b/gogo/runtime/src/main/java/org/apache/felix/service/command/CommandSession.java
@@ -103,12 +103,28 @@
 
     Object convert(Class<?> type, Object instance);
 
+    //
+    // Job support
+    //
+
+    /**
+     * List jobs. Always return a non-null list.
+     */
     List<Job> jobs();
 
+    /**
+     * Get the job running in the current thead or null.
+     */
     Job currentJob();
 
+    /**
+     * Get the current foreground job or null.
+     */
     Job foregroundJob();
 
+    /**
+     * Set the job listener for this session.
+     */
     void setJobListener(JobListener listener);
 
 }