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);