diff --git a/scripts/Diffraction/isis_powder/routines/common.py b/scripts/Diffraction/isis_powder/routines/common.py
index a1413d8d09237d6a88a0ce8aab60cd3c882253ba..60378e6b51879c9c45a1d3d3fca28eb1baba9624 100644
--- a/scripts/Diffraction/isis_powder/routines/common.py
+++ b/scripts/Diffraction/isis_powder/routines/common.py
@@ -149,6 +149,12 @@ def generate_run_numbers(run_number_string):
 
 
 def _generate_vanadium_name(vanadium_string, is_spline, *args):
+    """
+    :param vanadium_string: The number of the run being processed
+    :param is_spline: True if the workspace to save out is a spline
+    :param args: Any other strings to append to the filename
+    :return: A filename for the vanadium
+    """
     out_name = 'Van'
     if is_spline:
         out_name += 'Splined'