--- a/Depth4Image.st	Tue Mar 27 15:41:04 2018 +0200
+++ b/Depth4Image.st	Tue Mar 27 15:41:11 2018 +0200
@@ -76,7 +76,7 @@
 !Depth4Image methodsFor:'accessing-pixels'!
 
 pixelAtX:x y:y
-    "retrieve a pixel at x/y; return a pixelValue.
+    "retrieve a pixel at x/y; return a pixelValue (0..15).
      The interpretation of the returned value depends on the photometric
      and the colormap. See also Image>>atX:y:)
      Pixels start at x=0 , y=0 for upper left pixel, end at
@@ -105,7 +105,7 @@
 !
 
 pixelAtX:x y:y put:aPixelValue
-    "set the pixel at x/y to aPixelValue.
+    "set the pixel at x/y to aPixelValue (0..15).
      The interpretation of the pixelValue depends on the photometric
      and the colormap. (see also: Image>>atX:y:put:)
      Pixels start at x=0 , y=0 for upper left pixel, end at