diff --git a/etc/scdaq/scdaq.conf b/etc/scdaq/scdaq.conf
index c194bebbd569e923d58c4089b63de70184728b0c..71647b673a65737d88fef183882753ea084a7ecf 100644
--- a/etc/scdaq/scdaq.conf
+++ b/etc/scdaq/scdaq.conf
@@ -28,7 +28,7 @@ packets_per_report:200000
 # number of orbits per DMA packet, in decimal
 NOrbitsPerDMAPacket:20
 
-# number of orbits per DMA packet, in decimal
+# prescale factor, used for *calo* data only
 prescale_factor:20
 
 ## Extra settings for "filedma" input
diff --git a/test/config/scdaq-calo.conf b/test/config/scdaq-calo.conf
index a1d3f0afa808af585c317c0422d9d1eb5c912f12..8d8d08abdee32d6b8ad9d0183215d26691905848 100644
--- a/test/config/scdaq-calo.conf
+++ b/test/config/scdaq-calo.conf
@@ -28,6 +28,9 @@ packets_per_report:200000
 # number of orbits per DMA packet, in decimal
 NOrbitsPerDMAPacket:20
 
+# prescale that will be used for *calo* data only
+prescale_factor:20
+
 ## Extra settings for "filedma" input
 
 #input_file:/dev/shm/testdata.bin
diff --git a/test/config/scdaq-gmt.conf b/test/config/scdaq-gmt.conf
index 74d04a5ca8329e725c3aba83d856706b96227196..cec8f07db8cfa5745822f54ef49d9f24e4aa07d1 100644
--- a/test/config/scdaq-gmt.conf
+++ b/test/config/scdaq-gmt.conf
@@ -28,6 +28,9 @@ packets_per_report:200000
 # number of orbits per DMA packet, in decimal
 NOrbitsPerDMAPacket:20
 
+# prescale factor applied to *calo* data only
+prescale_factor:20
+
 ## Extra settings for "filedma" input
 
 #input_file:/dev/shm/testdata.bin