--- a
+++ b/clustering/data/readme.txt
@@ -0,0 +1,5 @@
+criteria sentences and MetaMap results:         criteria_sentences_preprocessed_metamap_filter(19185).json
+feature matrix for clustering:                  feature_matrix_data.csv
+clustering results:                             hierarchical_cluster_results.csv
+
+We involved two biomedical researchers reviewed the clustering results, merged similar clusters by judging similarity of their criteria sentences expressions, and summarized 44 semantic categories.