diff --git a/Doc/library/turtle.rst b/Doc/library/turtle.rst
index 55905fe..0f368ad 100644
--- a/Doc/library/turtle.rst
+++ b/Doc/library/turtle.rst
@@ -708,7 +708,10 @@
       >>> turtle.left(90)
       >>> turtle.heading()
       90.0
-      >>> turtle.degrees(400.0)  # angle measurement in gon
+
+      Change angle measurement unit to grad (also known as gon,
+      grade, or gradian and equals 1/100-th of the right angle.)
+      >>> turtle.degrees(400.0)
       >>> turtle.heading()
       100.0
       >>> turtle.degrees(360)
@@ -1455,6 +1458,7 @@
    :param args: a color string or three numbers in the range 0..colormode or a
                 3-tuple of such numbers
 
+
    Set or return background color of the TurtleScreen.
 
    .. doctest::