add docstring

nifty_gridder.cc

@@ -526,6 +526,24 @@ np.array((nxdirty, nydirty), dtype=np.float64)
     the image with the taper applied
 )""";
 
+constexpr auto apply_wscreen_DS = R"""(
+Applies the w screen to an image
+
+Parameters
+==========
+dirty: nd.array((nxdirty, nydirty), dtype=np.complex128)
+    the image
+w : float
+    the w value to use
+adjoint: bool
+    if True, apply the complex conjugate of the w screen
+
+Returns
+=======
+np.array((nxdirty, nydirty), dtype=np.complex128)
+    the image with the w screen applied
+)""";
+
 constexpr auto GridderConfig_DS = R"""(
 Class storing information related to the gridding/degridding process.
 
@@ -1530,7 +1548,8 @@ PYBIND11_MODULE(nifty_gridder, m)
     .def("dirty2grid", &GridderConfig<double>::dirty2grid,
       dirty2grid_DS, "dirty"_a)
     .def("dirty2grid_c", &GridderConfig<double>::dirty2grid_c, "dirty"_a)
-    .def("apply_wscreen", &GridderConfig<double>::apply_wscreen, "dirty"_a, "w"_a, "adjoint"_a)
+    .def("apply_wscreen", &GridderConfig<double>::apply_wscreen,
+      apply_wscreen_DS, "dirty"_a, "w"_a, "adjoint"_a)
 
     // pickle support
     .def(py::pickle(