diff --git a/MAC/Deployment/data/OTDB/PythonControl.comp b/MAC/Deployment/data/OTDB/PythonControl.comp
index d26614e4e899c5faaabe70152b5442ff2fcde7a2..743394cd7f97f6b3e401cb18850c6ea6a070514c 100644
--- a/MAC/Deployment/data/OTDB/PythonControl.comp
+++ b/MAC/Deployment/data/OTDB/PythonControl.comp
@@ -14,6 +14,7 @@ par  pythonHost		 I    text   -	100	0	'CCU001'					-		"Machine the Pythonscript
 par  runtimeDirectory	 I    text   -	100	0	'/home/pipeline/runtime/${MSNUMBER}/run'	-	"Where to start the programs"
 par  resultDirectory	 I    text   -	100	0	'lexar001:/data/${MSNUMBER}/output'		-	"Where to store the results"
 par  workingDirectory	 I    text   -	100	0	'/data/scratch/${MSNUMBER}/work'			-	"Where to store temporarely files"
+par  observationDirectory	 I    text   -	100	0	'L${YEAR}_${MSNUMBER}'			-	"Subdirectory where the datafiles were stored by the online processes."
 par  canCommunicate	 I    bool   -	10	0	'true'			-	"Temp flag to tell MAC if the current PythonController can respond to CONTROL_xxx messages"
 
 #uses  ApplCtrl    4.0.0  development 	1	"The ACC controller"