diff --git a/src/SNP_calling.nf b/src/SNP_calling.nf
index cdc2782dd5e3f94e8efa102c443a77a1583b612c..84027a8d56450222387e2ec45b94d7a6bee926cc 100644
--- a/src/SNP_calling.nf
+++ b/src/SNP_calling.nf
@@ -129,6 +129,9 @@ process mapping_fastq {
   }
 """
 bowtie2 --very-sensitive -p ${task.cpus} -x ${index_id} \
+--rg-id ${sample_name} \
+--rg SM:${sample_name} \
+--rg PL:Illumina \
 -1 ${reads[0]} -2 ${reads[1]} 2> \
 ${pair_id}_bowtie2_report.txt | \
 samtools view -Sb - > ${pair_id}.bam