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-rw-r--r--doc/lispref/files.texi4
1 files changed, 3 insertions, 1 deletions
diff --git a/doc/lispref/files.texi b/doc/lispref/files.texi
index 804cef292ee..e7a0ad2d06c 100644
--- a/doc/lispref/files.texi
+++ b/doc/lispref/files.texi
@@ -2355,7 +2355,9 @@ didn't end with a slash.
@end group
@end example
-A zero-length directory or component is not allowed.
+A @var{directory} or components that are @code{nil} or the empty
+string are ignored---they are filtered out first and do not affect the
+results in any way.
This is almost the same as using @code{concat}, but @var{dirname} (and
the non-final components) may or may not end with slash characters,