diff --git a/PIL/ImagePalette.py b/PIL/ImagePalette.py
index 5aabaa138..f80259f04 100644
--- a/PIL/ImagePalette.py
+++ b/PIL/ImagePalette.py
@@ -22,7 +22,19 @@ from PIL import ImageColor
 
 
 class ImagePalette(object):
-    "Color palette for palette mapped images"
+    """
+    Color palette for palette mapped images
+
+    :param mode: The mode to use for the Palette. See:
+        :ref:`concept-modes`. Defaults to "RGB"
+    :param palette: An optional palette. If given, it must be a bytearray,
+        an array or a list of ints between 0-255 and of length ``size`` 
+        times the number of colors in ``mode``. The list must be aligned
+        by channel (All R values must be contiguous in the list before G
+        and B values.) Defaults to 0 through 255 per channel.
+    :param size: An optional palette size. If given, it cannot be equal to
+        or greater than 256. Defaults to 0.
+    """
 
     def __init__(self, mode="RGB", palette=None, size=0):
         self.mode = mode