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diff --git a/doc/arithmetic.tex b/doc/arithmetic.tex
index 713eedc..f16f04f 100644
--- a/doc/arithmetic.tex
+++ b/doc/arithmetic.tex
@@ -87,6 +87,23 @@ is however not implemented because it is
not deemed important enough and would
be detrimental to libzahl's simplicity.
+{\tt zadd} and {\tt zadd\_unsigned} support
+in-place operation:
+
+\begin{alltt}
+ zadd(a, a, b);
+ zadd(b, a, b); \textcolor{c}{/* \textrm{should be avoided} */}
+ zadd_unsigned(a, a, b);
+ zadd_unsigned(b, a, b); \textcolor{c}{/* \textrm{should be avoided} */}
+\end{alltt}
+
+\noindent
+Use this whenever possible, it will improve
+your performance, as it will involve less
+CPU instructions for each character-addition
+and it may be possible to elementation some
+character-additions.
+
\newpage
\section{Subtraction}