Update README.md

README.md

@@ -142,6 +142,8 @@ The files `train_filtered.csv`, `test_filtered.csv` and `valid_filtered.csv` are
 - `lon` : Longitude coordinate of the hotspot
 - `latitude` : Latitude coordinate of the hotspot
 - `num_complete_checklists` : Number of complete checklists collected in that hotspot
+- `bio_1` to `bio_19`: Environmental covariates values associated with that hotspot, extracted from the WorldClim model. For more details on each of these variables, please refer to Table 5 of the appendix.
+- `split` : The split associated with that hotspot (either `train`, `valid` or `test`)
 
 ## Authors