Fix typo

diff --git a/include/deal.II/dofs/dof_tools.h b/include/deal.II/dofs/dof_tools.h
index 79cf3de253ba7ae1348b33b0c029afceef1d9f0a..4107d83082ab95146eb883443d0dc20fcf14b717 100644 (file)
--- a/include/deal.II/dofs/dof_tools.h
+++ b/include/deal.II/dofs/dof_tools.h
@@ -1158,7 +1158,7 @@ namespace DoFTools
    * [https://en.wikipedia.org/wiki/Bloch_wave](https://en.wikipedia.org/wiki/Bloch_wave).
    * The solution at @p face_2 is equal to the solution at @p face_1 times
    * @p periodicity_factor. For example, if the solution at @p face_1 is
-   * $\psi(0)$ and $\mathbf{d} is the corresponding point on @p face_2, then
+   * $\psi(0)$ and $\mathbf{d}$ is the corresponding point on @p face_2, then
    * the solution at @p face_2 should be
    * $\psi(d) = \psi(0)e^{-i \mathbf{k}\cdot \mathbf{d}}$. This condition can be
    * implemented using