diff --git a/src/solvers.jl b/src/solvers.jl
index d64bdff..ddfceb9 100644
--- a/src/solvers.jl
+++ b/src/solvers.jl
@@ -199,6 +199,9 @@ function get_boundary_assembly(solver::Solver)
         new_constraints = get_nonzero_rows(C2_)
         overconstrained_dofs = intersect(already_constrained, new_constraints)
         if length(overconstrained_dofs) != 0
+            warn("overconstrained dofs $overconstrained_dofs")
+            warn("already constrained = $already_constrained")
+            warn("new constraints = $new_constraints")
             overconstrained_dofs = sort(overconstrained_dofs)
             overconstrained_nodes = find_nodes_by_dofs(problem, overconstrained_dofs)
             warn("in overconstrained nodes $overconstrained_nodes")