diff --git a/@stack/pop.m b/@stack/pop.m
index 2b504607369307c4e1a04d4c73222e3779138a4f..06d67e6fb0bdedf96e68dc525fbfd03abccd080e 100644
--- a/@stack/pop.m
+++ b/@stack/pop.m
@@ -1,7 +1,8 @@
 function self = pop(self)
 %increase the stack pointer and return 'top' node data
 % usage :
-%   element = pop(stack)
+%   stack = pop(stack)
+%   element = element(stack)
 
 % $Id$