--- a/doc/book/en/A02b-components.en.txt	Thu Apr 23 12:03:24 2009 -0700
+++ b/doc/book/en/A02b-components.en.txt	Thu Apr 23 12:11:58 2009 -0700
@@ -68,7 +68,7 @@
 
 Once you modified your data model, you need to synchronize the
 database with your model. For this purpose, `CubicWeb` provides
-a very usefull command ``cubicweb-ctl shell blogdemo`` which
+a very useful command ``cubicweb-ctl shell blogdemo`` which
 launches an interactive migration Python shell. (see 
 :ref:`cubicweb-ctl-shell` for more details))
 As you modified a relation from the `BlogEntry` schema,

--- a/doc/book/en/B0012-schema-definition.en.txt	Thu Apr 23 12:03:24 2009 -0700
+++ b/doc/book/en/B0012-schema-definition.en.txt	Thu Apr 23 12:11:58 2009 -0700
@@ -124,7 +124,7 @@
     or not within all entities of the same type (false by default)
 
   - `indexed` : boolean indicating if an index needs to be created for this 
-    attribute in the database (false by default). This is usefull only if
+    attribute in the database (false by default). This is useful only if
     you know that you will have to run numerous searches on the value of this
     attribute.
 

--- a/doc/book/en/D020-cookbook.txt	Thu Apr 23 12:03:24 2009 -0700
+++ b/doc/book/en/D020-cookbook.txt	Thu Apr 23 12:11:58 2009 -0700
@@ -9,7 +9,7 @@
 
 * How to import LDAP users in `CubicWeb`?
 
-  Here is a very usefull script which enables you to import LDAP users
+  Here is a very useful script which enables you to import LDAP users
   into your `CubicWeb` application by running the following: ::