diff --git a/README.md b/README.md
index 3b1c423..fad061d 100644
--- a/README.md
+++ b/README.md
@@ -1,4 +1,4 @@
-# Renal MRI protocols
+# Purpose
 
 This repository holds a collection of renal MRI acquisition protocols that are compliant with the PARENCHIMA technical recommendations for clinical renal MRI put forward by Task force 1.2:
 
@@ -10,4 +10,31 @@ The published papers will list the recommendations in vendor-neutral language, a
 
 The list of protocols in this respository is dynamic and will be updated as and when the recommendations are revised. 
 
-If you have protocols that are compliant with the recommendations and that you would like to share, please create a pull request. They will be revised by the chairs of the expert panels for compliance with the recommendations before merging with the master repository.
+# Contribute
+
+If you have protocols that are compliant with the recommendations and that you would like to share, please contact Dr. Pim Pullens (Pim.Pullens@uzgent.be, University Hospital Ghent, Belgium). He will collate the data and forward to the expert panels who will check for compliance with the recommendations before merging with the master repository.
+
+The following data and materials must be provided for each protocol:
+
+1. An ordered list of protocol authors for credit
+2. A reference to the paper (or study) where the protocol is applied
+3. Scanner type, software version and coil info
+
+For Siemens:
+
+1. PDF output of the protocol (mandatory)
+2. If possible, edx/exar1 files
+3. At least one DICOM file for each protocol step if possible
+
+For Philips:
+
+1. Text output of each sequence in the protocol (mandatory)
+2. ExamCard if possible
+3. At least one DICOM file for each protocol step if possible
+
+For GE:
+
+1. PDF file of the protocol (mandatory)
+2. At least one DICOM file of each sequence in the protocol (mandatory)
+3. Protocol Exchange files if possible
+(Note: We need DICOM and/or Protocol Exchange files, because the information in the PDF is limited)