Issue #8 - Better helptext about placement of key file

README.md

@@ -57,8 +57,9 @@ when editing, making it even more important that this provider not be
 used in a production environment.
 * **File:** Stores the key in a file, which can be anywhere in the file
 system, as long as it's readable by the user that runs the web server.
-Storing the key in a file outside of the web root is generally more
-secure than storing it in the database.
+You will be required to manually create this file with the key and place
+it on your server. Storing the key in a file outside of the web root is
+generally more secure than storing it in the database.
 
 Both the Configuration and File provider plugins support storing the
 key with Base64 encoding.

plugins/key_provider/file.inc

@@ -45,7 +45,7 @@ function key_provider_file_build_configuration_form($form, &$form_state) {
   $form['file_location'] = array(
     '#type' => 'textfield',
     '#title' => t('File location'),
-    '#description' => t('The location of the file in which the key will be stored. The path may be absolute (e.g., %abs), relative to the Backdrop directory (e.g., %rel), or defined using a stream wrapper (e.g., %str).',
+    '#description' => t('The location of the file in which the key will be stored. The path may be absolute (e.g., %abs), relative to the Backdrop directory (e.g., %rel), or defined using a stream wrapper (e.g., %str). You will need to manually place this file on your server with the key in it.',
       array(
         '%abs' => '/etc/keys/foobar.key',
         '%rel' => '../keys/foobar.key',