Update README.md

klauswiese · Oct 2, 2021 · cf6c8fc · cf6c8fc
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@@ -30,7 +30,7 @@ install_github("klauswiese/pnlt")
 
 # Datasets
 
-All spatial data is an [**sf** object](https://r-spatial.github.io/sf/) with [geographic coordinate reference system](https://epsg.io/4326) (EPSG:4326), here is a list of the available objects:
+All spatial data is an [**sf** object](https://r-spatial.github.io/sf/) with geographic [coordinate reference system](https://docs.qgis.org/3.16/en/docs/gentle_gis_introduction/coordinate_reference_systems.html) [(EPSG:4326)](https://epsg.io/4326), here is a list of the available objects:
 
 ## 1. Administrative limits