Update README.md

README.md

@@ -112,3 +112,10 @@ Testrun runs CheckM2's genome quality prediction models on three (complete, unco
 |TEST1 | d__Bacteria;p__Proteobacteria;c__Gammaproteobacteria;o__Enterobacterales;f__Enterobacteriaceae;g__Escherichia;s__Escherichia coli |100| 0.74| 99.97| 0.04|
 |TEST2 | d__Bacteria;p__Patescibacteria;c__Dojkabacteria;o__SC72;f__SC72;g__UBA5209;s__UBA5209 sp002840365 | 98.54 | 0.21|79.86| 0.00|
 |TEST3 | d__Archaea;p__Nanohaloarchaeota;c__Nanosalinia;o__Nanosalinales;f__Nanosalinaceae;g__Nanohalobium;s__Nanohalobium sp001761425 | 98.75 |0.51| 87.77 |0.00| 
+
+# Databases
+
+CheckM2 will automatically download and install the reference database. However, if for some reason you are unable to to do so through CheckM2 but still wish to run CheckM2, you can download it from zenodo from the URL below and use it with CheckM2 using the `--database_path /path/to/downloaded_db/uniref100.KO.1.dmnd` argument or export it to the CHECKM2DB environmental variable: 
+
+Current reference database (v.1.0.2):
+https://zenodo.org/record/5571251/