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 [![install with bioconda](https://img.shields.io/badge/install%20with-bioconda-brightgreen.svg)](http://bioconda.github.io/)
 [![Docker](https://img.shields.io/docker/automated/nfcore/smrnaseq.svg)](https://hub.docker.com/r/nfcore/smrnaseq)
 
+[![DOI](https://zenodo.org/badge/140590861.svg)](https://zenodo.org/badge/latestdoi/140590861)
+
+
+
 ## Introduction
 **nf-core/smrnaseq** is a bioinformatics best-practice analysis pipeline used for small RNA sequencing data.
 
diff --git a/docs/usage.md b/docs/usage.md
index 384bcd90..951648fb 100644
--- a/docs/usage.md
+++ b/docs/usage.md
@@ -144,7 +144,7 @@ Default: "illumina"
 | illumina      | Illumina TruSeq Small RNA               | clip_R1 = 0; three_prime_clip_R1 = 0 | TGGAATTCTCGGGTGCCAAGG |
 | nextflex      | BIOO SCIENTIFIC  NEXTFLEX Small RNA-Seq | clip_R1 = 4; three_prime_clip_R1 = 4 | TGGAATTCTCGGGTGCCAAGG |
 | qiaseq        | QIAGEN QIAseq miRNA                     | clip_R1 = 0; three_prime_clip_R1 = 0 | AACTGTAGGCACCATCAAT   |
-| cats          | Diagenode CATS Small RNA-seq            | clip_R1 = 3; three_prime_clip_R1 = 0 | GATCGGAAGAGCACACGTCTG |
+| cats          | Diagenode CATS Small RNA-seq            | clip_R1 = 3; three_prime_clip_R1 = 0 | AAAAAAAAAAA + GATCGGAAGAGCACACGTCTG (only polyA is used for trimming) |
 
 ## Reference genomes