matplotlib
diff --git a/‎lib/matplotlib/cbook/deprecation.py‎
Lines changed: 4 additions & 4 deletions b/‎lib/matplotlib/cbook/deprecation.py‎
Lines changed: 4 additions & 4 deletions
diff --git a/‎lib/matplotlib/tests/test_axes.py‎
Lines changed: 11 additions & 0 deletions b/‎lib/matplotlib/tests/test_axes.py‎
Lines changed: 11 additions & 0 deletions
@@ -285,18 +285,18 @@ def func(good_name): ...
     signature = inspect.signature(func)
     assert old not in signature.parameters, (
         f"Matplotlib internal error: {old!r} cannot be a parameter for "
-        "{func.__name__}()")
+        f"{func.__name__}()")
     assert new in signature.parameters, (
         f"Matplotlib internal error: {new!r} must be a parameter for "
-        "{func.__name__}()")
+        f"{func.__name__}()")
 
     @functools.wraps(func)
     def wrapper(*args, **kwargs):
         if old in kwargs:
             warn_deprecated(
                 since, message=f"The {old!r} parameter of {func.__name__}() "
-                f"has been renamed {new!r} since {since}; support for the old "
-                f"name will be dropped %(removal)s.")
+                f"has been renamed {new!r} since Matplotlib {since}; support "
+                f"for the old name will be dropped %(removal)s.")
             kwargs[new] = kwargs.pop(old)
         return func(*args, **kwargs)
 
 
@@ -1719,6 +1719,17 @@ def test_hist2d_transpose():
     ax.hist2d(x, y, bins=10, rasterized=True)
 
 
+def test_hist2d_density_normed():
+    x, y = np.random.random((2, 100))
+    ax = plt.figure().subplots()
+    for obj in [ax, plt]:
+        obj.hist2d(x, y, density=True)
+        with pytest.warns(MatplotlibDeprecationWarning):
+            obj.hist2d(x, y, normed=True)
+        with pytest.warns(MatplotlibDeprecationWarning):
+            obj.hist2d(x, y, density=True, normed=True)
+
+
 class TestScatter(object):
     @image_comparison(baseline_images=['scatter'],
                       style='mpl20', remove_text=True)