diff --git a/magick/threshold.c b/magick/threshold.c
index 708151d..8113da1 100644
--- a/magick/threshold.c
+++ b/magick/threshold.c
@@ -660,7 +660,7 @@
 %                                                                             %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
-%  ClampImage() restricts the color range from 0 to pixel depth.
+%  ClampImage() restricts the color range from 0 to the quantum depth.
 %
 %  The format of the ClampImageChannel method is:
 %