[file-roller] help: Password and size splitting only available if file format supports it

[Andre Klapper <aklapper src gnome org>]

commit d98afa991ac39b5e631e31d1d51b320c9036dde8
Author: Andre Klapper <a9016009 gmx de>
Date:   Sun Feb 9 20:15:11 2020 +0100

    help: Password and size splitting only available if file format supports it

 help/C/archive-create.page | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)
---
diff --git a/help/C/archive-create.page b/help/C/archive-create.page
index c47e9e52..e9df0049 100644
--- a/help/C/archive-create.page
+++ b/help/C/archive-create.page
@@ -41,7 +41,8 @@
        <p>By clicking <gui>Other Options</gui> you can set a password or
        split your new archive into smaller, individual files by selecting the
        relevant option and specifying the volume for each part in
-       <gui>MB</gui>.</p>
+       <gui>MB</gui>. These options are only available if the chosen archive
+       file format supports them.</p>
       </note>
     </item>
     <item>