diff --git a/Doc/lib/libcmath.tex b/Doc/lib/libcmath.tex
index 107fa8b..0a4a667 100644
--- a/Doc/lib/libcmath.tex
+++ b/Doc/lib/libcmath.tex
@@ -52,7 +52,7 @@
 Note that the selection of functions is similar, but not identical, to
 that in module \code{math}.  The reason for having two modules is,
 that some users aren't interested in complex numbers, and perhaps
-don't even know what they are.  They would rather have \code{math(-1)}
+don't even know what they are.  They would rather have \code{math.sqrt(-1)}
 raise an exception than return a complex number.  Also note that the
 functions defined in \code{cmath} always return a complex number, even
 if the answer can be expressed as a real number (in which case the