From 15a0b0d04660fdec8c231ec4d1054ff5f5274610 Mon Sep 17 00:00:00 2001
From: Craig Scott <craig.scott@crascit.com>
Date: Sat, 26 Oct 2019 16:20:14 +1100
Subject: Help: math() expressions must be representable as signed 64-bit

---
 Help/command/math.rst | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/Help/command/math.rst b/Help/command/math.rst
index 3cbe719..ddb1ec6 100644
--- a/Help/command/math.rst
+++ b/Help/command/math.rst
@@ -8,7 +8,8 @@ Evaluate a mathematical expression.
   math(EXPR <variable> "<expression>" [OUTPUT_FORMAT <format>])
 
 Evaluates a mathematical ``<expression>`` and sets ``<variable>`` to the
-resulting value.
+resulting value.  The result of the expression must be representable as a
+64-bit signed integer.
 
 The mathematical expression must be given as a string (i.e. enclosed in
 double quotation marks). An example is ``"5 * (10 + 13)"``.
-- 
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