diff --git a/doc/lispref/files.texi b/doc/lispref/files.texi
index ac49c5aa745..ec8a2525ed9 100644
--- a/doc/lispref/files.texi
+++ b/doc/lispref/files.texi
@@ -2343,7 +2343,7 @@ entirely of directory separators.
 @end example
 @end defun
 
-@defun directory-append filename directory
+@defun directory-append directory filename
 Combine @var{filename} with @var{directory} by optionally putting a
 slash in the middle.