diff --git a/doc/lispref/os.texi b/doc/lispref/os.texi
index 9b6752c5e1..4f7d47305f 100644
--- a/doc/lispref/os.texi
+++ b/doc/lispref/os.texi
@@ -2707,7 +2707,7 @@ File Notifications
 
 Since all these libraries emit different events on notified file
 changes, there is the Emacs library @code{filenotify} which provides a
-unique interface.
+unified interface.
 
 @defun file-notify-add-watch file flags callback
 Add a watch for filesystem events pertaining to @var{file}.  This