diff --git a/doc/bn.tex b/doc/bn.tex
index 4d12a83..65e5268 100644
--- a/doc/bn.tex
+++ b/doc/bn.tex
@@ -2133,11 +2133,6 @@ These work like the full mp\_int capable variants except the second parameter $b
 functions fairly handy if you have to work with relatively small numbers since you will not have to allocate
 an entire mp\_int to store a number like $1$ or $2$.
 
-\index{mp\_mul\_si}
-\begin{alltt}
-int mp_mul_si(mp_int *a, long b, mp_int *c);
-\end{alltt}
-Just like the functions above but with the ability to use a signed input as the small number.
 
 The division by three can be made faster by replacing the division with a multiplication by the multiplicative inverse of three.
 
@@ -2243,7 +2238,6 @@ Other macros which are either shortcuts to normal functions or just other names
 \end{alltt}
 
 
-
 \input{bn.ind}
 
 \end{document}