use imperative
diff --git a/Include/abstract.h b/Include/abstract.h
index 4bc9952a..6e850b8 100644
--- a/Include/abstract.h
+++ b/Include/abstract.h
@@ -1021,7 +1021,7 @@
 
      PyAPI_FUNC(PyObject *) PySequence_Fast(PyObject *o, const char* m);
        /*
-     Returns the sequence, o, as a list, unless it's already a
+     Return the sequence, o, as a list, unless it's already a
      tuple or list.  Use PySequence_Fast_GET_ITEM to access the
      members of this list, and PySequence_Fast_GET_SIZE to get its length.