diff --git a/src/echosms/scattermodelbase.py b/src/echosms/scattermodelbase.py
index ddf088e..ca2c3fd 100644
--- a/src/echosms/scattermodelbase.py
+++ b/src/echosms/scattermodelbase.py
@@ -62,7 +62,7 @@ def calculate_ts(self, data, expand=None, inplace=False, multiprocess=False):
             Split the ts calculation across CPU cores.
 
         expand : bool
-            Only applicable if `data` is a dict. The default is `False`. If `True`, will expand
+            Only applicable if `data` is a dict. The default is `False`. If `True`, will return
             the dict into a DataFrame containing the Cartesian product of all values in the dict
             (with one column per key in the dict) and return that DataFrame, adding a column
             named `ts` for the TS results.