New upstream version 1.4.2upstream/1.4.2upstream

1 files changed, 5 insertions, 2 deletions

diff --git a/tests/filename.h b/tests/filename.h
index e353363e..e37a373e 100644
--- a/tests/filename.h
+++ b/tests/filename.h
@@ -1,5 +1,5 @@
 /* Basic filename support macros.
-   Copyright (C) 2001-2025 Free Software Foundation, Inc.
+   Copyright (C) 2001-2026 Free Software Foundation, Inc.
    This file is part of the GNU C Library.
 
    The GNU C Library is free software; you can redistribute it and/or
@@ -49,7 +49,10 @@ extern "C" {
                                any notion of "current directory".
    IS_RELATIVE_FILE_NAME(Filename)
                                tests whether Filename may be concatenated
-                               to a directory filename.
+                               to a directory filename to yield the name
+                               of a file relative to that directory.
+                               Watch out: IS_RELATIVE_FILE_NAME ("") is 1
+                               even though "" is not a relative file name.
    Note: On native Windows, OS/2, DOS, "c:" is neither an absolute nor a
    relative file name!
    IS_FILE_NAME_WITH_DIR(Filename)  tests whether Filename contains a device