diff --git a/templates/null.tpl b/templates/null.tpl
index 94ae026..7c30267 100644
--- a/templates/null.tpl
+++ b/templates/null.tpl
@@ -1,5 +1,25 @@
 {%- extends 'basic.tpl' -%}
 
+{#
+
+Null template, Does nothing except defining a basic structure
+To layout the diferents blocks of a notebook.
+
+Subtemplates can Override Blocks to define their custom reresentation.
+
+If one of the block you do overrite is nt a leave block, consider
+calling super.
+
+{% block nonLeaveBlock %}
+    #add stuff at beginning
+    {{ super() }}
+    #add stuff at end
+{% endblock nonLeaveBlock %}
+
+consider calling super even if block is leave block, we might insert more block later.
+
+#}
+
 {% block codecell scoped  %}
 {% block in_prompt %}{% endblock in_prompt %}
 {% block input %}{% endblock input %}
diff --git a/templates/python-armor.tpl b/templates/python-armor.tpl
new file mode 100644
index 0000000..2015cf9
--- /dev/null
+++ b/templates/python-armor.tpl
@@ -0,0 +1,10 @@
+{%- extends 'python.tpl' -%}
+
+{% block codecell %}
+==============================
+=======start codecell=========
+{{ super() }}
+======= end codecell =========
+==============================
+{% endblock codecell %}
+