diff --git a/README.md b/README.md
index d9b201893dc6a023ce86b14072a2908a0cc12622..c5ba728297caa9aa5dccda4c98f22cc425edf722 100644
--- a/README.md
+++ b/README.md
@@ -7,7 +7,9 @@ Both filterbanks are critically sampled, polyphase filterbanks (PFB). The subban
 For more information on the the apertif_matlab package see:
 
 * The matlab/apertif_matlab_readme.txt briefly decribes each script
-* The matlab/apertif_arts_firmware_model.pdf describes the quantization model of the subband filterbank and channel filterbank. The Python script apertif_arts_firmware_model.py runs the model.
+* The matlab/ASTRON_RP_010888_Apertif_Arts_firmware_model.pdf describes the quantization model of the subband filterbank and channel filterbank. The Python script apertif_arts_firmware_model.py runs the model.
+
+To run the python code it is necessary to first get the desp_tools from [3].
 
 ## References
 
@@ -16,6 +18,8 @@ For more information on the the apertif_matlab package see:
 [2] "The application of UniBoard as a beam former for APERTIF”, A. Gunst, A. Szomoru, G. Schoonderbeek, E. Kooistra, D. van der Schuur, H. Pepping, Experimental Astronomy, Volume 37, Issue 1, pp 55-67, February 2014, doi:1
 0.1007/s10686-013-9366-x.
 
+[3] https://github.com/erkooi/desp_tools
+
 
 If you use (part of) the **apertif_matlab** package please attribute the use as indicated this citation NOTICE:
 
@@ -25,7 +29,5 @@ The apertif_matlab package is Open Source and available under the following LICE
 
 ### [LICENSE](LICENSE.md)
 
-The apertif_matlab package was developed at [ASTRON] and used in several projects, but others have contributed and are welcome to contribute as well. The CREDITS lists the contributers of apertif_matlab:
-
 
 [ASTRON]:https://www.astron.nl