diff --git a/README.md b/README.md
index 8b7cfd3..88d04f0 100644
--- a/README.md
+++ b/README.md
@@ -35,7 +35,10 @@ It will try the following methods in sequence:
  5. Failed ? `Exit` with error message
  
 The `cat`+`grep` method will fail on PDFs without a `/MediaBox`.   
-You may install any of the optionals to be used in that case.   
+You may install any of the optionals to be used in that case.  
+  
+MacOS is fine using `mdls` if the metadata of the file is accurate.  
+The metadata is generated automatically by the OS (SpolLight)
   
 ##### apt-get
 ```