Update README.md

README.md

@@ -73,7 +73,7 @@ Required parameters:
 - `-o`: Output directory
 - `-r`: Path to the reference genome fasta file
 
-Please note that the input BAM should be one that's aligned to the ENTIRE reference genome (either GRCh38 or GRCh37/hg19), and this reference should NOT include ALT contigs. The fasta file of this reference genome should be provided to Paraphase with `-r`. 
+Please note that the input BAM should be one that's aligned to the ENTIRE reference genome (either GRCh38 or GRCh37/hg19), and this reference should NOT include ALT contigs. The fasta file of this reference genome should be provided to Paraphase with `-r`. Recommendations on reference genomes to use are documented [here](https://github.com/PacificBiosciences/reference_genomes).
 
 Optional parameters:
 - `-g`: Region(s) to analyze, separated by comma. All supported [regions](docs/regions.md) will be analyzed if not specified. Please use region name, i.e. first column in the doc.