Expire partial template?

[anitviec]

I have two templates as follow:

app/views/projects/show.html.erb

<% cache project do %>
All documents
<%= render project.documents %>
<% end %>

app/views/documents/_document.html.erb

<% cache document do %>
My document: <%= document.name %>
<%= render document.comments %>

<% end %>

When I change html in _document.html.erb, I refresh the page, but it does not update.
What should I do so that the view auto update when I change partial template?

Thanks.