diff --git a/Doc/lib/libsys.tex b/Doc/lib/libsys.tex
index d55aac3eff5..bd496fe70d4 100644
--- a/Doc/lib/libsys.tex
+++ b/Doc/lib/libsys.tex
@@ -21,7 +21,7 @@ It is always available.
 
 \begin{datadesc}{byteorder}
   An indicator of the native byte order.  This will have the value
-  \code{'big'} on big-endian (most-signigicant byte first) platforms,
+  \code{'big'} on big-endian (most-significant byte first) platforms,
   and \code{'little'} on little-endian (least-significant byte first)
   platforms.
   \versionadded{2.0}