master 495bf22727a 3/5: Add NEWS.unknown file to correct versions of introduction

[Mattias Engdegård]

branch: master
commit 495bf22727a0e980c4677ad4acd229e125d69d03
Author: Mattias Engdegård <mattiase@acm.org>
Commit: Mattias Engdegård <mattiase@acm.org>

    Add NEWS.unknown file to correct versions of introduction
    
    It is not intended for the human reader, but to give less wrong versions
    of first appearance displayed by `describe-function` or
    `describe-variable` that would otherwise be derived from a notice in a
    more recent NEWS* file.
    
    It is better to add items to this file than changing historical NEWS*
    files when the actual version of introduction is not known.
    
    * etc/NEWS.unknown: New file.  Add entry for `nthcdr`.
---
 etc/NEWS.unknown | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/etc/NEWS.unknown b/etc/NEWS.unknown
new file mode 100644
index 00000000000..4a6d68dcae0
--- /dev/null
+++ b/etc/NEWS.unknown
@@ -0,0 +1,14 @@
+This file contains mentions of functions and variables whose
+version of introduction would otherwise be guessed incorrectly
+by M-x describe-function.
+
+Since much of early Emacs source history is lost, these versions are
+conservative estimates: the actual version of first appearance may very
+well be much earlier.
+
+* Changes in Emacs 13.8
+This may be the earliest surviving version with source code, although
+damaged.  See
+https://github.com/larsbrinkhoff/emacs-history/decuslib.com/decus/vax85b/gnuemax
+
+** 'nthcdr'