diff --git a/edvart/utils.py b/edvart/utils.py
index 2ff67ab..0c9e201 100755
--- a/edvart/utils.py
+++ b/edvart/utils.py
@@ -105,7 +105,7 @@ def reindex_to_period(
     period_column : str
         Which column containing periods to index by.
     freq : Union[str, pd.Offset]
-        One of pandas’ offset strings or an Offset object. Will be inferred by default.
+        One of pandas' offset strings or an Offset object. Will be inferred by default.
     keep_index : str, optional
         Name of column to store the original index. The original index will be discarded
         by default.