diff --git a/pages/AcmeTinyNoApache.md b/pages/AcmeTinyNoApache.md
index 3cef1b4..9da8e7b 100644
--- a/pages/AcmeTinyNoApache.md
+++ b/pages/AcmeTinyNoApache.md
@@ -23,7 +23,7 @@ And challenges needs a self-referential sub-directory
 mkdir /home/acme/challenges/.well-known
 ln -s /home/acme/challenges /home/acme/challenges/.well-known/acme-challenge
 chown -R acme:www-data challenges
-chmow og+rx challenges
+chmow og+rX challenges
 ...
 
 I do not have git on small machines, so just grab the code with fetch.  Being lazy, I just fetch the source into /home/acme.