Update parcels/grid.py

Co-authored-by: Vecko <[email protected]>

Author: erikvansebille

parcels/grid.py

@@ -694,7 +694,7 @@ def add_periodic_halo(self, zonal, meridional, halosize=5):
         halosize : int
             size of the halo (in grid points). Default is 5 grid points
         """
-        raise NotImplementedError("CurvilinearGrid does not support add_periodic_halo")
+        raise NotImplementedError("CurvilinearGrid does not support add_periodic_halo. See https://github.com/OceanParcels/Parcels/pull/1811")
 
 
 class CurvilinearZGrid(CurvilinearGrid):