message: Small update in the comments/doxygen comments in class
  HyperelasticNLFIntegrator.
diff: @@ -158,9 +158,12 @@ public:
  /** Hyperelastic integrator for any given HyperelasticModel.
  - Represents @f$ \int W(Jpt) dx @f$ over a target zone,
  - where W is the @a model's strain energy density function, and
  - Jpt is the Jacobian of the target->physical coordinates transformation. */
  +
  + Represents @f$ \int W(Jpt) dx @f$ over a target zone, where W is the
  + @a model's strain energy density function, and Jpt is the Jacobian of the
  + target->physical coordinates transformation. The target configuration is
  + given by the current mesh at the time of the evaluation of the intergrator.
  +*/
  class HyperelasticNLFIntegrator : public NonlinearFormIntegrator
  {
  private:
  @@ -171,9 +174,11 @@ private:
  // Jpt: the Jacobian of the target-to-physical-element transformation.
  // P: represents dW_d(Jtp) (dim x dim).
  // DSh: gradients of reference shape functions (dof x dim).
  - // DS: represents d(Jtp)_dx (dof x dim).
  - // PMatI: current coordinates of the nodes (dof x dim).
  - // PMat0: represents dW_dx (dof x dim).
  + // DS: gradients of the shape functions in the target (stress-free)
  + // configuration (dof x dim).
  + // PMatI: coordinates of the deformed configuration (dof x dim).
  + // PMatO: reshaped view into the local element contribution to the operator
  + // output - the result of AssembleElementVector() (dof x dim).
  DenseMatrix DSh, DS, Jrt, Jpr, Jpt, P, PMatI, PMatO;
  public:
  