diff --git a/manuals/ponysay.texinfo b/manuals/ponysay.texinfo
index 93c71d3e..3e4c942f 100644
--- a/manuals/ponysay.texinfo
+++ b/manuals/ponysay.texinfo
@@ -2094,9 +2094,10 @@ Source Mage @w{GNU/Linux}.
 @cindex exotic os:es
 
 An "exotic operating system" as a operating system that is not GNU (GNU/Linux ("Linux")
-and GNU/Hurd are GNU distors.)
+and GNU/Hurd are GNU distor:s.)
 
 @cindex mac os x
+@cindex os x
 Ponysay is told to be running on Mac OS X, which is Unix-like OS meaning that probably
 all future version of ponysay will be able to run without any problems.