diff --git a/classes/phosphor-pid-control.bbclass b/classes/phosphor-pid-control.bbclass
index 573420b..482b218 100644
--- a/classes/phosphor-pid-control.bbclass
+++ b/classes/phosphor-pid-control.bbclass
@@ -1,2 +1,5 @@
-sensor_datadir="${datadir}/swampd/sensor"
+config_datadir="${datadir}/swampd/"
+# config_path is the location swampd expects to find a json configuration.
+# the file is expected to be named config.json
+config_path="${config_datadir}/config.json"