diff --git a/app/controllers/my_profile/cms_controller.rb b/app/controllers/my_profile/cms_controller.rb
index b364bcf..8f66936 100644
--- a/app/controllers/my_profile/cms_controller.rb
+++ b/app/controllers/my_profile/cms_controller.rb
@@ -104,6 +104,10 @@ class CmsController < MyProfileController
     redirect_to :action => (@article.parent ? 'view' : 'index'), :id => @article.parent
   end
 
+  def why_categorize
+    render :action => params[:action], :layout => false
+  end
+
   protected
 
   def redirect_back
diff --git a/app/views/cms/edit.rhtml b/app/views/cms/edit.rhtml
index 186cb2e..5d9cf76 100644
--- a/app/views/cms/edit.rhtml
+++ b/app/views/cms/edit.rhtml
@@ -8,7 +8,15 @@
 
   <%= render :partial => partial_for_class(@article.class), :locals => { :f => f } %>
 
-  <%= select_categories(:article) %>
+  <% button_bar do %>
+    <%= submit_button :save, _('Save') %>
+  <% end %>
+
+  <div style='float: right'>
+    <%= lightbox_button :help, _('Why categorize?'), :action => 'why_categorize' %>
+  </div>
+
+  <%= select_categories(:article, _('Categorize your article')) %>
 
   <%# TODO display the tooltip (title below) in a directly visible way %>
   <%= f.text_field('tag_list', :size => 64) +
diff --git a/app/views/cms/why_categorize.rhtml b/app/views/cms/why_categorize.rhtml
new file mode 100644
index 0000000..b97bf7a
--- /dev/null
+++ b/app/views/cms/why_categorize.rhtml
@@ -0,0 +1,9 @@
+<strong><%= _('Why categorize?') %></strong>
+
+<p>
+<%= _('By categorizing your content, you increase the possibility that other people access it. When they are looking for, say, articles about Bahia and you categorize your article in "Regions/Bahia", then there is a good change that your article is going to be found.') %>
+</p>
+
+<% button_bar do %>
+  <%= lightbox_close_button _('OK') %>
+<% end %>
diff --git a/test/functional/cms_controller_test.rb b/test/functional/cms_controller_test.rb
index af48392..c8d90d4 100644
--- a/test/functional/cms_controller_test.rb
+++ b/test/functional/cms_controller_test.rb
@@ -400,4 +400,20 @@ class CmsControllerTest < Test::Unit::TestCase
     assert_tag :tag => 'a', :attributes => { :href => "/myprofile/#{profile.identifier}/cms/view/#{f.id}" }, :descendant => { :content => /Cancel/ }
   end
 
+  should 'link to page explaining about categorization' do
+    get :edit, :profile => profile.identifier, :id => profile.home_page.id
+    assert_tag :tag => 'a', :attributes => { :href => "/myprofile/#{profile.identifier}/cms/why_categorize" }
+  end
+
+  should 'present popup' do
+    get :why_categorize, :profile => profile.identifier
+    assert_template 'why_categorize'
+    assert_no_tag :tag => 'body'
+  end
+
+  should 'display OK button on why_categorize popup' do
+    get :why_categorize, :profile => profile.identifier
+    assert_tag :tag => 'a', :attributes => { :rel => 'deactivate'} # lightbox close button
+  end
+
 end
--
libgit2 0.21.2