diff --git a/screening/dist/etc/service.properties b/screening/dist/etc/service.properties
index 517568d4d8fc3c60bda41893ce991b4d3319a453..e0e6dd717f2ecece47297228408d743231385d12 100644
--- a/screening/dist/etc/service.properties
+++ b/screening/dist/etc/service.properties
@@ -271,6 +271,8 @@ split-channels-images.type-extractor.is-measured = true
 
 split-channels-images.storage-processor = ch.systemsx.cisd.openbis.dss.etl.PlateStorageProcessor
 split-channels-images.storage-processor.generate-thumbnails = false
+# The first specified channel will be blue, the second will be green and the third will be red.
+# If there are more channels, combinations of colors will be used.
 split-channels-images.storage-processor.channel-codes = GFP, DAPI
 split-channels-images.storage-processor.channel-labels = Gfp, Dapi
 split-channels-images.storage-processor.well_geometry = 3x3