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-rw-r--r--Help/command/math.rst3
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diff --git a/Help/command/math.rst b/Help/command/math.rst
index 3cbe719e5..ddb1ec63c 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)"``.