[3.13] gh-121160: Note that readline libraries using different history formats. ...

This is not something we can do too much about, without help from the
underlying libraries.
(cherry picked from commit 709db44255eb5d73fc22a1341dd0253e71ddfda9)

Co-authored-by: Petr Viktorin <encukou@gmail.com>

diff --git a/Doc/library/readline.rst b/Doc/library/readline.rst
index 5658b93c81dc99a44a669a54e9d3b0b12a7effde..d03b71597130cfed66102c9469568fe578384912 100644 (file)
--- a/Doc/library/readline.rst
+++ b/Doc/library/readline.rst
@@ -45,6 +45,10 @@ Readline library in general.
     python:bind -v
     python:bind ^I rl_complete
 
+  Also note that different libraries may use different history file formats.
+  When switching the underlying library, existing history files may become
+  unusable.
+
 .. data:: backend
 
    The name of the underlying Readline library being used, either