diff --git a/python/prophet/forecaster.py b/python/prophet/forecaster.py
index 2c37b5e95..d3b1aef96 100644
--- a/python/prophet/forecaster.py
+++ b/python/prophet/forecaster.py
@@ -1892,7 +1892,7 @@ def _make_historical_mat_time(
         np.ndarray[tuple[int], np.dtype[np.float64]],
     ]:
         """
-        Creates a matrix of slope-deltas where these changes occured in training data according to the trained prophet obj
+        Creates a matrix of slope-deltas where these changes occurred in training data according to the trained prophet obj
         """
         if single_diff is None:
             single_diff = np.diff(t_time).mean()