Editing templates for integration with isso

Hello. I am trying to add comments to all blogs on a single WF instance using just one isso instance. I have created isso.tmpl containing this:

{{ define "isso" }}
<!-- isso stuff here or just some text for testing -->
{{ end }}

And included it in post.tmpl between <article> and <footer> like this:

{{ template "isso" }}

But I cannot see any text or isso thread after I restart WF.
Where am I wrong?
I am using WF 0.12.0 on Linux amd64.