diff --git a/phasecalculator/io/phasetransferxmlcreator.py b/phasecalculator/io/phasetransferxmlcreator.py
index affa4fbbba9c2df24d3a34b215b0000c0b799f4c..0ef4b68dcfe9ed54d4b1e83486d78c1d157f3868 100755
--- a/phasecalculator/io/phasetransferxmlcreator.py
+++ b/phasecalculator/io/phasetransferxmlcreator.py
@@ -63,11 +63,11 @@ def create_phase_file(mole_fraction_dict_list_by_temp, phase_filename, **kwargs)
 
     Parameters
     ----------
-    mole_fraction_dict_list : list of dicts
-        List of dictionaries of name: mole fraction pairs per phase to
-        create.
-    temperature_info : list of dicts
-        Temperature information with dictionaries containing value and unit.
+    mole_fraction_dict_list_by_temp : list of lists
+        List containing temperature: phase mole fractions pairs for phases to
+        create XML for. Phase mole fractions contains a list of dictionaries
+        of name: mole fraction pairs per phase to create. Temperature
+        information with dictionaries containing value and unit.
     phase_filename : str
         Phase XML output filename.
     solvent_filename : str, optional