diff --git a/gtsam/inference/Factor.h b/gtsam/inference/Factor.h
index b73eff9d0..6ed9c809b 100644
--- a/gtsam/inference/Factor.h
+++ b/gtsam/inference/Factor.h
@@ -36,7 +36,7 @@ template<class KEY> class Conditional;
  * which will be the type used to label variables.  Key types currently in use
  * in gtsam are Index with symbolic (IndexFactor, SymbolicFactorGraph) and
  * Gaussian factors (GaussianFactor, JacobianFactor, HessianFactor, GaussianFactorGraph),
- * and Symbol with nonlinear factors (NonlinearFactor, NonlinearFactorGraph).
+ * and Key with nonlinear factors (NonlinearFactor, NonlinearFactorGraph).
  * though currently only IndexFactor and IndexConditional derive from this
  * class, using Index keys.  This class does not store any data other than its
  * keys.  Derived classes store data such as matrices and probability tables.
diff --git a/gtsam/linear/GaussianMultifrontalSolver.h b/gtsam/linear/GaussianMultifrontalSolver.h
index a38bb3161..322aacfc6 100644
--- a/gtsam/linear/GaussianMultifrontalSolver.h
+++ b/gtsam/linear/GaussianMultifrontalSolver.h
@@ -100,6 +100,8 @@ public:
    * Compute the marginal joint over a set of variables, by integrating out
    * all of the other variables.  This function returns the result as a factor
    * graph.
+   *
+   * NOTE: This function is limited to computing a joint on 2 variables
    */
   GaussianFactorGraph::shared_ptr jointFactorGraph(const std::vector<Index>& js) const;