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diff --git a/Doc/lib/libaudioop.tex b/Doc/lib/libaudioop.tex
index ff76e72..774a92e 100644
--- a/Doc/lib/libaudioop.tex
+++ b/Doc/lib/libaudioop.tex
@@ -173,14 +173,19 @@ Reverse the samples in a fragment and returns the modified fragment.
\begin{funcdesc}{rms}{fragment, width}
Return the root-mean-square of the fragment, i.e.
+%begin{latexonly}
+\iftexi
+%end{latexonly}
the square root of the quotient of the sum of all squared sample value,
divided by the sumber of samples.
%begin{latexonly}
+\else
% in eqn: sqrt { sum S sub i sup 2 over n }
\begin{displaymath}
\catcode`_=8
\sqrt{\frac{\sum{{S_{i}}^{2}}}{n}}
\end{displaymath}
+\fi
%end{latexonly}
This is a measure of the power in an audio signal.
\end{funcdesc}