Update dae_solve.md

SciML · Jan 13, 2021 · fe4361e · fe4361e
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diff --git a/docs/src/solvers/dae_solve.md b/docs/src/solvers/dae_solve.md
@@ -62,6 +62,10 @@ extra options for the solvers, see the ODE solver page.
   stiff-aware 3rd order interpolant. 4th order on linear parabolic problems
   and 3rd order accurate on nonlinear parabolic problems (as opposed to lower
   if not corrected).
+- Rodas4P2 - A 4th order L-stable stiffly stable Rosenbrock method with a stiff-aware 
+  3rd order interpolant. 4th order on linear parabolic problems and 3rd order accurate 
+  on nonlinear parabolic problems. It is an improvement of Roadas4P and in case of 
+  inexact Jacobians a second order W method.
 - `Rodas5` - A 5th order A-stable stiffly stable Rosenbrock method. Currently has
   a Hermite interpolant because its stiff-aware 3rd order interpolant is not
   yet implemented.