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 @@
 
 \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}