diff --git a/Doc/lib/libmath.tex b/Doc/lib/libmath.tex
index 3590467..7f25eba 100644
--- a/Doc/lib/libmath.tex
+++ b/Doc/lib/libmath.tex
@@ -157,7 +157,7 @@
 Converts angle \var{x} from degrees to radians.
 \end{funcdesc}
 
-Hyerbolic functions:
+Hyperbolic functions:
 
 \begin{funcdesc}{cosh}{x}
 Return the hyperbolic cosine of \var{x}.