@end lisp
Usually the elimination of tail-recursive frames makes debugging more
-pleasant, since theses frames are mostly uninformative. If there is
-any doubt about how one function called another, it can usually be
+pleasant, since these frames are mostly uninformative. If there is any
+doubt about how one function called another, it can usually be
eliminated by finding the source location in the calling frame.
@xref{Source Location Printing}.