diff --git a/doc/petidomo.tex b/doc/petidomo.tex
index c20751a..b048b27 100644
--- a/doc/petidomo.tex
+++ b/doc/petidomo.tex
@@ -285,7 +285,7 @@ unless you do this.
 
 The final step, before Petidomo is successfully installed, is to set
 the right permissions to the installation directories and installed
-files. Unfortunately, the installation process can not do this
+files. Unfortunately, the installation process cannot do this
 automatically; you have to chose what permissions are ``right''
 yourself. If works like this: Petidomo will be called from sendmail,
 thanks to the aliases you just created. That means, that sendmail