Clarify a piece of documentation.

diff --git a/include/deal.II/numerics/error_estimator.h b/include/deal.II/numerics/error_estimator.h
index a9b3fa4a60876e7b3d85df7dbef5a85ac108273c..44f767ccfe7d30f40fde058f45954d90e0869233 100644 (file)
--- a/include/deal.II/numerics/error_estimator.h
+++ b/include/deal.II/numerics/error_estimator.h
@@ -117,10 +117,12 @@ namespace hp
  * contributions of the faces (which are the integrated square of the jumps
  * times some factor) of each cell and take the square root.
  *
- * The integration is done using a quadrature formula on the face. For linear
- * trial functions (FEQ1), QGauss (with two points) or even the QMidpoint rule
- * will suffice. For higher order elements, it is necessary to utilize higher
- * order quadrature formulae as well.
+ * The integration is done using a quadrature formula on the face
+ * provided by the caller of the estimate() functions declared by this
+ * class. For linear trial functions (FE_Q(1)), QGauss with two points
+ * or even the QMidpoint rule might actually suffice. For higher order
+ * elements, it is necessary to utilize higher order quadrature
+ * formulae with `fe.degree+1` Gauss points.
  *
  * We store the contribution of each face in a @p map, as provided by the C++
  * standard library, with the iterator pointing to that face being the key