diff --git a/doc/api/fs.md b/doc/api/fs.md
index cf46d9667981af..5e6ebae8dc5b8c 100644
--- a/doc/api/fs.md
+++ b/doc/api/fs.md
@@ -1852,7 +1852,7 @@ a new inode. The watch will emit an event for the delete but will continue
 watching the *original* inode. Events for the new inode will not be emitted.
 This is expected behavior.
 
-In AIX, save and close of a file being watched causes two notifications -
+On AIX, save and close of a file being watched causes two notifications -
 one for adding new content, and one for truncation. Moreover, save and
 close operations on some platforms cause inode changes that force watch
 operations to become invalid and ineffective. AIX retains inode for the