Add missing div on note on step-44

diff --git a/examples/step-44/doc/intro.dox b/examples/step-44/doc/intro.dox
index 2940deedb919fa2e057620a3c2f1accd8e6a8c5b..3a0937063e8b45dd8ed303a479ef2f3020d2608a 100644 (file)
--- a/examples/step-44/doc/intro.dox
+++ b/examples/step-44/doc/intro.dox
@@ -434,7 +434,7 @@ The third is the definition of the pressure $\widetilde{p}$.
 
 @note The simplified single-field derivation ($\mathbf{u}$ is the only primary variable) below makes it clear how we transform the limits of integration to the reference domain:
 @f{align*}
-\int_{\Omega}\delta \mathbf{u} \cdot [ \boldsymbol{\sigma} + \mathbf{b}^\text{p}]~\mathrm{d}v
+\int_{\Omega}\delta \mathbf{u} \cdot [\textrm{div}\ \boldsymbol{\sigma} + \mathbf{b}^\text{p}]~\mathrm{d}v
 &=
 \int_{\Omega} [-\mathrm{grad}\delta \mathbf{u}:\boldsymbol{\sigma} + \delta \mathbf{u} \cdot\mathbf{b}^\text{p}]~\mathrm{d}v
   + \int_{\partial \Omega} \delta \mathbf{u} \cdot \mathbf{t}^\text{p}~\mathrm{d}a \\