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@@ -2659,6 +2659,9 @@ if($1<20,teen,string("")) @r{"teen" if age $1 less than 20, else empty}
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Note that you can also use two org-specific flags @code{T} and @code{t} for
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durations computations @ref{Durations and time values}.
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+You can add your own Calc functions defined in Emacs Lisp with @code{defmath}
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+and use them in formula syntax for Calc.
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+
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@node Formula syntax for Lisp, Durations and time values, Formula syntax for Calc, The spreadsheet
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@subsection Emacs Lisp forms as formulas
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@cindex Lisp forms, as table formulas
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Michael Brand