+
+{\bf {\tt [~dihedral_restraints~]} :} restrain selected dihedrals to a reference value.
+The implementation of dihedral restraints is described in section \ssecref{dihedralrestraint} of the manual.
+The parameters specified in the [dihedral_restraints] directive are as follows:
+\begin{itemize}
+\item {\tt type} has only one possible value which is 1
+\item {\tt label} is unused and has been removed from the code.
+\item {\tt phi} is the value of $\phi_0$ in \eqnref{dphi} and \eqnref{dihre} of the manual.
+\item {\tt dphi} is the value of $\Delta\phi$ in \eqnref{dihre} of the manual.
+\item {\tt kfac} is analogous to {\tt fac} in the implementation of distance restraints. It is the factor by which the force constant is multiplied. By doing so, different restraints can be maintained with different force constants.
+\item {\tt power} is unused and has been removed from the code.
+\end{itemize}
+