diff --git a/Documentation.html b/Documentation.html
index 43db8fa1d..8e6e9113b 100644
--- a/Documentation.html
+++ b/Documentation.html
@@ -4319,7 +4319,7 @@ chmod o+rwx tmp
- In config.inc.php your host should be defined with a FQDN (fully qualified domain name) instead of "localhost".
- - Ensure that your target table is under the PBXT storage engine and has a LONGBLOB column.
+ - Ensure that your target table is under the PBXT storage engine and has a LONGBLOB column (which must be nullable if you want to remove the BLOB reference from it).
- When you insert or update a row in this table, put a checkmark on the "Upload to BLOB repository" optional choice; otherwise, the upload will be done directly in your LONGBLOB column instead of the repository.
- Finally when you browse your table, you'll see in your column a link to stream your data, for example "View image". A header containing the correct MIME-type will be sent to your browser; this MIME-type was stored at upload time but in case it's incorrect, it's possible to edit it by clicking on the displayed MIME-type.