diff --git a/Doc/library/pdb.rst b/Doc/library/pdb.rst
index 6c099b22b38c21..f72a356aab30f1 100644
--- a/Doc/library/pdb.rst
+++ b/Doc/library/pdb.rst
@@ -182,7 +182,7 @@ slightly different way:
 .. function:: post_mortem(traceback=None)
 
    Enter post-mortem debugging of the given *traceback* object.  If no
-   *traceback* is given, it uses the one of the exception that is currently
+   *traceback* is given, it uses one of the exceptions that is currently
    being handled (an exception must be being handled if the default is to be
    used).