Add a doxygen reference.

diff --git a/include/deal.II/base/polynomials_piecewise.h b/include/deal.II/base/polynomials_piecewise.h
index e8fa4ff67df2a7cd80dfaf0938e1470c4901bc20..5a0eebb460e934ea25c89210f7e6e0c3ea0c1155 100644 (file)
--- a/include/deal.II/base/polynomials_piecewise.h
+++ b/include/deal.II/base/polynomials_piecewise.h
@@ -48,6 +48,8 @@ namespace Polynomials
    * allow constructing FE_Q_iso_Q1 elements that put additional degrees of
    * freedom into an equivalent of a refined mesh instead of higher order
    * polynomials, which is useful when using mixed finite elements.
+   *
+   * @ingroup Polynomials
    */
   template <typename number>
   class PiecewisePolynomial : public Subscriptor