diff --git a/munin/files/munin.conf b/munin/files/munin.conf
index 1fdcd0d..5ab64c2 100644
--- a/munin/files/munin.conf
+++ b/munin/files/munin.conf
@@ -33,3 +33,7 @@
     {{ print_directive(directive, value) }}
     {%- endfor %}
 {% endfor %}
+
+{%- if config.get('formula_append') %}
+{{ config.formula_append }}
+{% endif %}
diff --git a/pillar.example b/pillar.example
index 0e02b27..1af0fcd 100644
--- a/pillar.example
+++ b/pillar.example
@@ -19,6 +19,9 @@ munin_master:
     "localhost.localdomain":
       address: "127.0.0.1"
       use_node_name: "no"
+  # In case you need additional variables
+  formula_append |
+    some_variable value
 
 munin_node:
   log_level: 4