diff --git a/README.md b/README.md
index 3a4b13d..c5b6447 100644
--- a/README.md
+++ b/README.md
@@ -122,7 +122,7 @@ graphbin --assembler megahit --graph /path/to/graph_file.gfa --contigs /path/to/
 ## Citation
 If you use GraphBin in your work, please cite GraphBin as,
 
-Vijini Mallawaarachchi, Anuradha Wickramarachchi, Yu Lin. GraphBin: Refined binning of metagenomic contigs using assembly graphs. Bioinformatics, Volume 36, Issue 11, June 2020, Pages 3307–3313, DOI: [10.1093/bioinformatics/btaa180](http://dx.doi.org/10.1093/bioinformatics/btaa180)
+Vijini Mallawaarachchi, Anuradha Wickramarachchi, Yu Lin. GraphBin: Refined binning of metagenomic contigs using assembly graphs. Bioinformatics, Volume 36, Issue 11, June 2020, Pages 3307–3313, DOI: [https://doi.org/10.1093/bioinformatics/btaa180](https://doi.org/10.1093/bioinformatics/btaa180)
 
 ```bibtex
 @article{10.1093/bioinformatics/btaa180,