diff --git a/Doc/library/tkinter.rst b/Doc/library/tkinter.rst
index ce5e63a..7d80b40 100644
--- a/Doc/library/tkinter.rst
+++ b/Doc/library/tkinter.rst
@@ -801,12 +801,13 @@
 Images
 ^^^^^^
 
-Bitmap/Pixelmap images can be created through the subclasses of
-:class:`Tkinter.Image`:
+Images of different formats can be created through the corresponding subclass
+of :class:`Tkinter.Image`:
 
-* :class:`BitmapImage` can be used for X11 bitmap data.
+* :class:`BitmapImage` for images in XBM format.
 
-* :class:`PhotoImage` can be used for GIF and PPM/PGM color bitmaps.
+* :class:`PhotoImage` for images in PGM, PPM, GIF and PNG formats. The latter
+  is supported starting with Tk 8.6.
 
 Either type of image is created through either the ``file`` or the ``data``
 option (other options are available as well).
diff --git a/Lib/lib-tk/Tkinter.py b/Lib/lib-tk/Tkinter.py
index 6198c4c..b226fd5 100644
--- a/Lib/lib-tk/Tkinter.py
+++ b/Lib/lib-tk/Tkinter.py
@@ -3362,7 +3362,7 @@
             self.tk.call('image', 'width', self.name))
 
 class PhotoImage(Image):
-    """Widget which can display colored images in GIF, PPM/PGM format."""
+    """Widget which can display images in PGM, PPM, GIF, PNG format."""
     def __init__(self, name=None, cnf={}, master=None, **kw):
         """Create an image with NAME.
 
@@ -3426,7 +3426,7 @@
         self.tk.call(args)
 
 class BitmapImage(Image):
-    """Widget which can display a bitmap."""
+    """Widget which can display images in XBM format."""
     def __init__(self, name=None, cnf={}, master=None, **kw):
         """Create a bitmap with NAME.