Update pySDC/implementations/problem_classes/GenericGusto.py

Co-authored-by: Dr Jemma Shipton <[email protected]>

Author: brownbaerchen

pySDC/implementations/problem_classes/GenericGusto.py

@@ -45,7 +45,7 @@ def __init__(
             solver_params (dict, optional): Solver parameters for the nonlinear variational problems
             stop_at_divergence (bool, optional): Whether to raise an error when the variational problems do not converge. Defaults to False
             LHS_cache_size (int, optional): Size of the cache for solvers. Defaults to 12.
-            residual (Firedrake.form, optional): Overwrite the residual of the equation, e.g. after adding spatial methods.
+            residual (Firedrake.form, optional): Overwrite the residual of the equation, e.g. after adding spatial methods. Defaults to None.
             *active_labels (:class:`Label`): labels indicating which terms of
                 the equation to include.
         """