diff --git a/doc/us/manual.html b/doc/us/manual.html
index 48a8e5b..a7e2efb 100644
--- a/doc/us/manual.html
+++ b/doc/us/manual.html
@@ -174,7 +174,7 @@ LuaFileSystem offers the following functions:
 
     <dt><a name="chdir"></a><strong><code>lfs.lock_dir(path, [seconds_stale])</code></strong></dt>
     <dd>Creates a lockfile (called lockfile.lfs) in <code>path</code> if it does not
-  exist and returns the lock. If the lock already exists checks it
+  exist and returns the lock. If the lock already exists checks if
   it's stale, using the second parameter (default for the second
   parameter is <code>INT_MAX</code>, which in practice means the lock will never
   be stale. To free the the lock call <code>lock:free()</code>. <br/>