From 0769af6f200b70025434f3935c9d998f5d0dd235 Mon Sep 17 00:00:00 2001
From: Frank Dellaert <dellaert@gmail.com>
Date: Tue, 19 Jan 2010 01:41:44 +0000
Subject: [PATCH] comment

---
 cpp/SubgraphPreconditioner.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/cpp/SubgraphPreconditioner.h b/cpp/SubgraphPreconditioner.h
index 6f5d1b7e6..c284f6ab3 100644
--- a/cpp/SubgraphPreconditioner.h
+++ b/cpp/SubgraphPreconditioner.h
@@ -62,6 +62,9 @@ namespace gtsam {
 
   /**
    * A linear system solver using subgraph preconditioning conjugate gradient
+   * Concept NonLinearSolver<G,T,L> implements
+   *   linearize: G * T -> L
+   *   solve : L -> VectorConfig
    */
 	template <class NonlinearGraph, class Config>
 	class SubgraphPCG {