diff --git a/redP_mimoCoRB.py b/redP_mimoCoRB.py
index 297e6503bfcdbbb9a462ea5f75b6383d3f3d485a..12afa9bbae4086f53240a8ecdcf4fa5c58781cbe 100644
--- a/redP_mimoCoRB.py
+++ b/redP_mimoCoRB.py
@@ -1,7 +1,8 @@
 """
 **redP_mimoCoRB**: use mimoCoRB with the RedPitaya and redPoscdaq.py 
 
-Input data is provided as numpy-arry of shape (number_of_channels, number_of_samples).
+Input data is provided as numpy-arry of shape (number_of_channels, number_of_samples)
+via callback of function data_sink() in class redP_mimoCoRB.
 """
 
 import time