update readme

readme.md

-# IML Checks for Icinga / Nagios
+# Graphs with Graphite module of Icinga
 
 ## Introduction
 
@@ -20,5 +20,15 @@ The checks are available in a sister repository.
 
 You need the graphite modul of icingaweb2 that points to a graphite service (Graphite can run on another server than Icinga).
 
+(1)
+
 On the Icinga server put the wanted ini into the folder 
-**/etc_incingaweb2/modules/graphite/templates/**
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+**/etc_incingaweb2/modules/graphite/templates/**
+
+(2)
+
+Inside an ini file have a look to the lines
+
+    check_command = "..."
+
+They need to match the name of a service (NOT the name of a check script) to apply the rules for a graph.
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