Update README.md

README.md

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 # qc-analysis-pipeline
 Workflows used for QC of WGS or WES data
 
-### Single Sample QC :
+### Single Sample QC
 This WDL pipeline implements QC in human whole-genome or exome/targeted sequencing data.
 
+For more on the metrics and aggregation of metrics from multiple workflow executions, please see the [qc-metric-aggregator](https://github.com/genome/qc-metric-aggregator) repository.
+
 #### Background
 
 As part of the [AnVIL](https://anvilproject.org/) Data Processing Working Group, a Quality Control (QC) workflow was developed to harmonize and summarize the QC for all WGS and WES sequence data sets ingested and released on the AnVIL.