diff --git a/docs/reference/ImageDraw.rst b/docs/reference/ImageDraw.rst
index 45be43057..30aa15a9b 100644
--- a/docs/reference/ImageDraw.rst
+++ b/docs/reference/ImageDraw.rst
@@ -91,11 +91,11 @@ Methods
     Draws an arc (a portion of a circle outline) between the start and end
     angles, inside the given bounding box.
 
-    :param xy: Four points to define the bounding box. Sequence of 
-            ``[x0, y0, x1, y1]``.
-    :param start: Starting angle, in degrees. Angles are measured from 
+    :param xy: Four points to define the bounding box. Sequence of
+            ``[(x0, y0), (x1, y1)]`` or ``[x0, y0, x1, y1]``.
+    :param start: Starting angle, in degrees. Angles are measured from
             3 o'clock, increasing clockwise.
-    :param end: Ending angle, in degrees. 
+    :param end: Ending angle, in degrees.
     :param fill: Color to use for the arc.
 
 .. py:method:: PIL.ImageDraw.Draw.bitmap(xy, bitmap, fill=None)
@@ -114,8 +114,8 @@ Methods
     Same as :py:meth:`~PIL.ImageDraw.Draw.arc`, but connects the end points
     with a straight line.
 
-    :param xy: Four points to define the bounding box. Sequence of 
-            ``[x0, y0, x1, y1]``.
+    :param xy: Four points to define the bounding box. Sequence of
+            ``[(x0, y0), (x1, y1)]`` or ``[x0, y0, x1, y1]``.
     :param outline: Color to use for the outline.
     :param fill: Color to use for the fill.
 
@@ -148,7 +148,7 @@ Methods
     center of the bounding box.
 
     :param xy: Four points to define the bounding box. Sequence of
-            ``[x0, y0, x1, y1]``.
+            ``[(x0, y0), (x1, y1)]`` or ``[x0, y0, x1, y1]``.
     :param outline: Color to use for the outline.
     :param fill: Color to use for the fill.