Typo: Added missing "if".
This is part of SF patch #442788.
diff --git a/Doc/lib/libos.tex b/Doc/lib/libos.tex
index b6e0bfa..dc250a1 100644
--- a/Doc/lib/libos.tex
+++ b/Doc/lib/libos.tex
@@ -995,7 +995,7 @@
parameter is relative to the current directory. If you want to use an
absolute path, make sure the first character is not a slash
(\character{/}); the underlying Win32 \cfunction{ShellExecute()}
-function doesn't work it is. Use the \function{os.path.normpath()}
+function doesn't work if it is. Use the \function{os.path.normpath()}
function to ensure that the path is properly encoded for Win32.
Availability: Windows.
\versionadded{2.0}