diff --git a/MAC/Deployment/data/OTDB/Observation.comp b/MAC/Deployment/data/OTDB/Observation.comp
index e0f2589c3dbb5583aa85f2fd18983b2b8d60f958..279b0fdc92bc817525dca5bbcd55cdf8a895657e 100644
--- a/MAC/Deployment/data/OTDB/Observation.comp
+++ b/MAC/Deployment/data/OTDB/Observation.comp
@@ -22,6 +22,7 @@ par  KSPType                 I    ptext  -      10    0      'eor|cosmicrays|sur
 par  bandFilter  	     I	  ptext	 -   	10    0	     'LBA_10_70|LBA_10_90|LBA_30_70|LBA_30_90|HBA_110_190|HBA_170_230|HBA_210_250;LBA_30_90' - 'one of the seven filters to use'
 par  antennaArray	     I	  ptext	 -   	10    0	     'LBA|HBA;LBA'			                   - 'Name of the antenneArray (AntennaArrays.conf)'
 par  receiverList	     I	  vint	 -   	10    0	     '[]'                                       - 'List of the receivers to use, eg.[0..7,10,11]. Range 0..191.'
+par  MSNameMask              I    text   -      10    0      '/data1/L${YEAR}_${MSNUMBER}/SB${SUBBAND}.MS' - 'Name for the Measurement set for this Observation'
 par  channelsPerSubband      I    int    -      10    100    256                                       - 'Number of channels per subband, preferred values:16,32,64,128,192,256'
 par  nrBeams                 I    int    -      10    100    1                                         - 'Number of simultaneous beams in this observation'
 par  nrAnaBeams              I    int    -      10    100    1                                         - 'Number of analog beams in this observation'