Update README.md

README.md

@@ -10,7 +10,7 @@ license_link: https://www.ebi.ac.uk/about/terms-of-use/
 
 This dataset contains study-level metadata from the [NHGRI-EBI GWAS Catalog](https://ebi.ac.uk/gwas), a manually curated repository of published genome-wide association studies (GWAS).
 
-Each record corresponds to a single GWAS publication or study entry curated by the GWAS Catalog. Unlike the [GWAS Associations dataset](https://huggingface.co/datasets/gwascatalog/associations), which represents individual SNP–trait associations, this dataset describes the study itself, including publication metadata, sample descriptions, genotyping platforms, traits investigated, and information about available summary statistics.
+Each record corresponds to a single GWAS publication or study entry curated by the GWAS Catalog. Unlike the [GWAS Associations dataset](https://huggingface.co/datasets/gwascatalog/associations), which represents individual SNP–trait associations, this dataset describes the study itself, including publication metadata, sample descriptions, genotyping platforms, traits investigated, and information about available summary statistics. The GWAS Catalog includes all GWAS studies, including those which do not report any significant associations, so some studies may not have corresponding associations in the /associations dataset.
 
 The GWAS Catalog aggregates results from thousands of genome-wide association studies and standardises metadata related to studies, cohorts, phenotypes, and genotyping technologies.
 
@@ -93,7 +93,6 @@ Expert curators review publications and extract key information including:
 * statistical significance metrics
 * effect sizes
 * sample descriptions
-* genomic location information
 
 ### 3. Standardisation
 
@@ -102,6 +101,7 @@ Extracted data are normalised using standardised vocabularies and identifiers wh
 * controlled trait terms from the [Experimental Factor Ontology (EFO)](https://www.ebi.ac.uk/efo/)
 * genomic coordinates
 * gene identifiers
+* standardised ancestry label [framework](https://link.springer.com/article/10.1186/s13059-018-1396-2) 
 
 ### 4. Annotation