--- loncom/html/adm/help/tex/Tolerance.tex	2003/05/29 20:30:51	1.3
+++ loncom/html/adm/help/tex/Tolerance.tex	2013/07/05 18:30:40	1.4
@@ -1,7 +1,7 @@
 \label{Tolerance}
 A \textbf{tolerance\index{tolerance}} parameter determines how closely
-the system will require the student's answer to be in order to count it correct.
-
+the system will require the student's answer to be in order to count it correct. 
+The tolerance parameter should always be defined for a numerical problem.
 
 For technical reasons, it is almost never a good idea to set this parameter
 to zero. Computers can only approximate computations involving real numbers. For instance,