[2861] Document possible values

diff --git a/src/bin/auth/datasrc_clients_mgr.h b/src/bin/auth/datasrc_clients_mgr.h
index 33698cc3f1a08c55554abaeecf382260346bf3fc..a2d3d1f219561336a9282e347592aa37d315f95b 100644 (file)
--- a/src/bin/auth/datasrc_clients_mgr.h
+++ b/src/bin/auth/datasrc_clients_mgr.h
@@ -109,8 +109,13 @@ struct Command {
     /// \brief Argument of the command.
     ///
     /// If the command takes no argument, it should be null pointer.
+    ///
+    /// This may be a null pointer if the command takes no parameters.
     data::ConstElementPtr params;
     /// \brief A callback to be called once the command finishes.
+    ///
+    /// This may be an empty boost::function. In such case, no callback
+    /// will be called after completion.
     FinishedCallback callback;
 };