diff --git a/README.txt b/README.txt
index bc0ac1547de474d17a2e57264c613ed3c28958e4..2d6d652fc3f6e110f3950795af9c465734d9ae00 100644
--- a/README.txt
+++ b/README.txt
@@ -1,6 +1,6 @@
 Recon_Spectro_MB.m is the program that executes the vGRAPPA algorithm
 
-one has to insert the low SNR single-band data of both voxels as .dat file
+one has to insert the low SNR single-band data of both voxels as .dat file (SIEMENS raw data format)
 
 also the multi-banded .dat data in the above mentioned program