diff --git a/README.md b/README.md
index f2887d67..e0116f51 100644
--- a/README.md
+++ b/README.md
@@ -114,12 +114,12 @@ Currently the following models are supported in MS2PIP:
 
 Model | Current version | Train-test dataset (unique peptides) | Evaluation dataset (unique peptides) | Median Pearson correlation on evaluation dataset
 -|-|-|-|-
-HCD | v20190107 | [MassIVE-KB](10.1016/j.cels.2018.08.004) (1 623 712) | [PXD008034](10.1016/j.jprot.2017.12.006) (35 269) | 0.903786
+HCD | v20190107 | [MassIVE-KB](https://doi.org/10.1016/j.cels.2018.08.004) (1 623 712) | [PXD008034](https://doi.org/10.1016/j.jprot.2017.12.006) (35 269) | 0.903786
 CID | v20190107 | [NIST CID Human](https://chemdata.nist.gov/) (340 356) | [NIST CID Yeast](https://chemdata.nist.gov/) (92 609) | 0.904947
-iTRAQ | v20190107 | [NIST iTRAQ](https://chemdata.nist.gov/) (704 041) | [PXD001189](10.1182/blood-2016-05-714048) (41 502) | 0.905870
-iTRAQphospho | v20190107 | [NIST iTRAQ phospho](https://chemdata.nist.gov/) (183 383) | [PXD001189](10.1182/blood-2016-05-714048) (9 088) | 0.843898
-TMT | v20190107 | [Peng Lab TMT Spectral Library](10.1021/acs.jproteome.8b00594) (1 185 547) | [PXD009495](10.15252/msb.20188242) (36 137) | 0.950460
-TTOF5600 | v20190107 | [PXD000954](10.1038/sdata.2014.31) (215 713) | [PXD001587](10.1038/nmeth.3255) (15 111) | 0.746823
+iTRAQ | v20190107 | [NIST iTRAQ](https://chemdata.nist.gov/) (704 041) | [PXD001189](https://doi.org/10.1182/blood-2016-05-714048) (41 502) | 0.905870
+iTRAQphospho | v20190107 | [NIST iTRAQ phospho](https://chemdata.nist.gov/) (183 383) | [PXD001189](https://doi.org/10.1182/blood-2016-05-714048) (9 088) | 0.843898
+TMT | v20190107 | [Peng Lab TMT Spectral Library](https://doi.org/10.1021/acs.jproteome.8b00594) (1 185 547) | [PXD009495](https://doi.org/10.15252/msb.20188242) (36 137) | 0.950460
+TTOF5600 | v20190107 | [PXD000954](https://doi.org/10.1038/sdata.2014.31) (215 713) | [PXD001587](https://doi.org/10.1038/nmeth.3255) (15 111) | 0.746823
 
 
 To train custom MS2PIPc models, please refer to [Training new MS2PIP models](https://github.com/compomics/ms2pip_c/wiki/Training_new_MS2PIP_models) on our Wiki pages.