diff --git a/src/yapsut/graphics.py b/src/yapsut/graphics.py
index 28d5162a4249a85d8a676d255b791357d6029219..133ba20970c421f44173a6d46449f72114b4d7a9 100644
--- a/src/yapsut/graphics.py
+++ b/src/yapsut/graphics.py
@@ -88,7 +88,9 @@ def ocirc(x,y,color=['white','black'],markersize=[30],scale=1.,zorder=None,mew=[
    return a
 
 def curveXY2patch(x,y,returnVectors=False,closed=True,draw=True, ax=None,color=None) :
-   """ Converts a curve in a patch """
+   """ Converts a curve in a patch
+         x,y = vectors with x and y
+   """
    import numpy as np
    from matplotlib import pyplot as plt
    from matplotlib.patches import Polygon