diff --git a/Doc/library/turtle.rst b/Doc/library/turtle.rst
index 95a57c57e71d56..154fcb4818f96b 100644
--- a/Doc/library/turtle.rst
+++ b/Doc/library/turtle.rst
@@ -753,7 +753,7 @@ Turtle motion
    is not a full circle, one endpoint of the arc is the current pen
    position.  Draw the arc in counterclockwise direction if *radius* is
    positive, otherwise in clockwise direction.  Finally the direction of the
-   turtle is changed by the amount of *extent*.
+   turtle is changed by the sign of the *extent*.
 
    As the circle is approximated by an inscribed regular polygon, *steps*
    determines the number of steps to use.  If not given, it will be