Update dae_solve.md

Author: ChrisRackauckas

docs/src/solvers/dae_solve.md

@@ -92,6 +92,12 @@ extra options for the solvers, see the ODE solver page.
   - `ROS34PW2` - A 4th order stiffy accurate Rosenbrock-W method for PDAEs.
   - `ROS34PW3` - A 4th order strongly A-stable (Rinf~0.63) Rosenbrock-W method.
 
+!!! note
+
+  `Rosenbrock23` and `Rosenbrock32` have a stiff-aware interpolation but this interpolation is not safe for the algebraic variables.
+  Thus use the interpolation (thus `saveat`) with caution if the default Hermite interpolation is used.
+
+    
 #### FIRK Methods
 
   - `RadauIIA5` - An A-B-L stable fully implicit Runge-Kutta method with internal