Updated the wording on the changes

CHANGELOG.md

@@ -10,7 +10,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - Modified the template for input csv file to include a `sample_name` column in addition to `sample` in-line with changes to [IRIDA-Next update] as seen with the [speciesabundance pipeline]
   - `sample_name` special characters will be replaced with `"_"`
   - If no `sample_name` is supplied in the column `sample` will be used
-  - To avoid repeat values for `sample_name` all `sample_name` values will be suffixed with the index of the `input` samplesheet.csv
+  - To avoid repeat values for `sample_name` all `sample_name` values will be suffixed with the unique `sample` value from the input file
 
 [IRIDA-Next update]: https://github.com/phac-nml/irida-next/pull/678
 [speciesabundance pipeline]: https://github.com/phac-nml/speciesabundance/pull/24