diff --git a/xarray/core/dataarray.py b/xarray/core/dataarray.py
index 8fefef5aff7..d82a3e06a56 100644
--- a/xarray/core/dataarray.py
+++ b/xarray/core/dataarray.py
@@ -6485,7 +6485,7 @@ def coarsen(
 
         Examples
         --------
-        Coarsen the long time series by averaging over every four days.
+        Coarsen the long time series by averaging over every three days.
 
         >>> da = xr.DataArray(
         ...     np.linspace(0, 364, num=364),