diff --git a/README.md b/README.md
index 7ccdea1..0712c21 100644
--- a/README.md
+++ b/README.md
@@ -35,16 +35,19 @@ Then, after completing _ONTrack_ installation, set the _BASECALLER_DIR_ variable
 
 * NCBI nt database (optional, in case you want to perform a local Blast analysis of your consensus sequences).
 
-For downloading the database (~65 GB):
+For downloading the database (~210 GB):
 
 ```
 mkdir NCBI_nt_db
 cd NCBI_nt_db
 echo `date +%Y-%m-%d` > download_date.txt
 wget ftp://ftp.ncbi.nlm.nih.gov/blast/db/nt*
-targz_files=$(find . | grep \.tar\.gz$ | sed 's/\.\///g')
-for f in $targz_files; do tar -xzvf $f; done
-rm $targz_files
+targz_files=$(find . | grep "\\.tar\\.gz$")
+for f in $targz_files; do
+  tar -xzvf $f;
+  rm $f;
+  rm $f".md5";
+done
 ```
 
 Then, after completing the _ONTrack_ installation, set the _NTDB_ variable in **config_MinION_mobile_lab.R** to the full path to NCBI_nt_db/nt