From 94f7f10ce64f6701632ddad5c29dac4e3fac4674 Mon Sep 17 00:00:00 2001
From: Richard Roberts <richard.jw.roberts@gmail.com>
Date: Mon, 1 Jul 2013 20:19:32 +0000
Subject: [PATCH] Added comment

---
 gtsam/symbolic/SymbolicFactorUnordered.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/gtsam/symbolic/SymbolicFactorUnordered.h b/gtsam/symbolic/SymbolicFactorUnordered.h
index 76aeec834..02200d870 100644
--- a/gtsam/symbolic/SymbolicFactorUnordered.h
+++ b/gtsam/symbolic/SymbolicFactorUnordered.h
@@ -114,7 +114,10 @@ namespace gtsam {
     }
   }; // IndexFactor
 
-
+  /** Dense elimination function for symbolic factors.  This is usually provided as an argument to
+   *  one of the factor graph elimination functions (see EliminateableFactorGraph).  The factor
+   *  graph elimination functions do sparse variable elimination, and use this function to eliminate
+   *  single variables or variable cliques. */
   GTSAM_EXPORT std::pair<boost::shared_ptr<SymbolicConditionalUnordered>, boost::shared_ptr<SymbolicFactorUnordered> >
     EliminateSymbolicUnordered(const std::vector<SymbolicFactorUnordered::shared_ptr>& factors, const std::vector<Key>& keys);