added building howto for NetBSD
diff --git a/doc/bn.tex b/doc/bn.tex
index 85f0607..ef8d141 100644
--- a/doc/bn.tex
+++ b/doc/bn.tex
@@ -185,7 +185,7 @@ NetBSD is not as strict as OpenBSD but still needs \texttt{gmake} to build the s
pkg_add gmake libtool
\end{alltt}
Please check with \texttt{libtool --version} that installed libtool is indeed a GNU libtool.
-Build the shared library with:
+Build the shared library by typing:
\begin{alltt}
gmake -f makefile.shared
\end{alltt}