diff --git a/faq.html b/faq.html
index cdfa0a82..7b85c523 100644
--- a/faq.html
+++ b/faq.html
@@ -488,7 +488,7 @@ You can anyway use it if you limit the use of the parity disk to contain only th
 </tr>
 <tr>
 <td>ext4</td>
-<td>OK if the disks are NOT bigger than 16 TB.</td>
+<td>OK if the disks are NOT bigger than 16 TB. The parity is stored in a single big file, and ext4 has a upper limit of 16 TB for file size.</td>
 </tr>
 <tr>
 <td>XFS</td>