diff --git a/src/PIL/ImageFilter.py b/src/PIL/ImageFilter.py
index 63d6dcf5c..33bc7cc2e 100644
--- a/src/PIL/ImageFilter.py
+++ b/src/PIL/ImageFilter.py
@@ -35,7 +35,7 @@ class BuiltinFilter(MultibandFilter):
 
 class Kernel(BuiltinFilter):
     """
-    Create a convolution kernel.  The current version only
+    Create a convolution kernel. The current version only
     supports 3x3 and 5x5 integer and floating point kernels.
 
     In the current version, kernels can only be applied to
@@ -43,9 +43,10 @@ class Kernel(BuiltinFilter):
 
     :param size: Kernel size, given as (width, height). In the current
                     version, this must be (3,3) or (5,5).
-    :param kernel: A sequence containing kernel weights.
+    :param kernel: A sequence containing kernel weights. The kernel will
+                   be flipped vertically before being applied to the image.
     :param scale: Scale factor. If given, the result for each pixel is
-                    divided by this value.  The default is the sum of the
+                    divided by this value. The default is the sum of the
                     kernel weights.
     :param offset: Offset. If given, this value is added to the result,
                     after it has been divided by the scale factor.