Index: doc/README.variables
===================================================================
RCS file: /usr/cvsroot/asterisk/doc/README.variables,v
retrieving revision 1.46
diff -u -r1.46 README.variables
--- doc/README.variables	16 May 2005 00:43:16 -0000	1.46
+++ doc/README.variables	16 Jun 2005 01:38:19 -0000
@@ -310,12 +324,20 @@
 numeric or string constants were replaced with a variable reference ${CALLERIDNUM}, for
 instance.
 
- 
+__________________________
+Numbers vs Strings
+--------------------------
+
+Tokens consisting only of numbers are converted to 64-bit numbers for most of the
+operators. This means that overflows can occur when the numbers get above 18 digits.
+Warnings will appear in the logs in this case.
+
+
 ___________________________
 CONDITIONALS
 ---------------------------
 
 There is one conditional operator - the conditional goto : 
 
 	exten => 1,2,gotoif(condition?label1:label2)