diff --git a/test/fmcadc100m14b4cha/python/test23.py b/test/fmcadc100m14b4cha/python/test23.py
index 4eca8b6671cfebd58ba33d0ba163180c0c9d1bb2..f7c6d200218ca5778cce894a9d9704f7fad73aee 100755
--- a/test/fmcadc100m14b4cha/python/test23.py
+++ b/test/fmcadc100m14b4cha/python/test23.py
@@ -31,6 +31,7 @@ from fmc_adc import *
 
 """
 test23: Write IPMI information and calibration data to FMC EEPROM.
+        Serial number and calibration data are taken from text files.
 
 Note: Requires test00.py to run first to load the firmware!
 """