Update README.md

eblerjana · Feb 21, 2023 · f2803b7 · f2803b7
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@@ -72,7 +72,7 @@ Note especially the third property listed above. See the figure below for an ill
 
 ![alt text](images/input-representation.png)
 
-We typically generate such VCFs from haplotype-resolved assemblies using this pipeline: https://bitbucket.org/jana_ebler/vcf-merging . However, any VCF with the properties listed above can be used as input. 
+We typically generate such VCFs from haplotype-resolved assemblies using this pipeline: https://bitbucket.org/jana_ebler/vcf-merging . However, any VCF with the properties listed above can be used as input. Note again that the haplotypes must be phased into a single phased block. So phased VCFs generated by phasing tools like WhatsHap are not suitable!
 
 #### What should I do if my input VCF contains overlapping variants?