List incompatible change

diff --git a/doc/news/changes/incompatibilities/20170111MartinKronbichler b/doc/news/changes/incompatibilities/20170111MartinKronbichler
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+Changed: The class FE_DGQ used to provide a protected constructor taking a
+one-dimensional Quadrature argument. This has been changed in favor of a
+constructor taking a vector of polynomials. To use the old constructor, you
+can create a vector of polynomials by replacing the argument
+<code>quadrature_1d</code> by
+<code>Polynomials::generate_complete_Lagrange_basis(quadrature_1d.get_points())</code>. In
+addition, the class FE_DGQArbitraryNodes that defines the public interface
+taking a one-dimensional quadrature formula is unchanged, so only user codes
+that derive directly from FE_DGQ should be affected.
+<br>
+(Martin Kronbichler, 2017/01/11)