diff --git a/Doc/lib/libcmath.tex b/Doc/lib/libcmath.tex
index 4873346..c9886bb 100644
--- a/Doc/lib/libcmath.tex
+++ b/Doc/lib/libcmath.tex
@@ -40,7 +40,7 @@
 \end{funcdesc}
 
 \begin{funcdesc}{exp}{x}
-Return the exponential value $\mbox{e}^x$.
+Return the exponential value \code{e**\var{x}}.
 \end{funcdesc}
 
 \begin{funcdesc}{log}{x}