edit docstring

Signed-off-by: Nitish Bharambe <78108900+nitbharambe@users.noreply.github.com>

Author: nitbharambe

src/power_grid_model_io/converters/pandapower_converter.py

@@ -244,6 +244,7 @@ def _extra_info_to_pgm_input_data(self, extra_info: ExtraInfo):
     def _extra_info_to_pp_input_data(self, extra_info: ExtraInfo):
         """
         Converts extra component info into node_lookup
+        Currently, it is possible to only retrieve the derating factor (df) of trafo.
 
         Args:
             extra_info: a dictionary where the node reference ids are stored