add notes about NaNs probable origin in SPEI

Ouranosinc · Sep 11, 2023 · 06271eb · 06271eb
1 parent 8f1868e
commit 06271eb
Showing 1 changed file with 2 additions and 0 deletions.
diff --git a/xclim/indices/_agro.py b/xclim/indices/_agro.py
@@ -1447,6 +1447,8 @@ def standardized_precipitation_evapotranspiration_index(
 
     Notes
     -----
+    If results include NaNs, check that the `offset` parameter is larger than the minimum water budget values.
+
     See Standardized Precipitation Index (SPI) for more details on usage.
     """
     uses_default_offset = offset == "1 mm/d"