add short summary

Author: DaanVanHauwermeiren

pandas/core/series.py

@@ -2745,6 +2745,8 @@ def _take(self, indices, axis=0, convert=True, is_copy=False):
 
     def isin(self, values):
         """
+        Check whether ``values`` are contained in ``Series``.
+
         Return a boolean ``Series`` showing whether each element in the
         ``Series`` is exactly contained in the passed sequence of ``values``.