diff --git a/potx.inc b/potx.inc
index 70406b0..27d0053 100644
--- a/potx.inc
+++ b/potx.inc
@@ -1920,8 +1920,8 @@ function _potx_init_yaml_translation_patterns($path = '') {
  *     - test_label_2:
  *         # An optional key, used as context for the translatable string.
  *         context: label_2_context
- *     # You can use an empty string to mark all values for top-level keys as translatable.
- *     - ''
+ *     # To mark all top-level keys as translatable, use the '%top-level-key' string.
+ *     - %top-level-key
  * @endcode
  *
  * @param string $path
@@ -1975,10 +1975,10 @@ function _potx_parse_yaml_file($code, $file_name, $save_callback) {
  */
 function _potx_find_yaml_translatables($yaml, $trans_list, $file_name, $save_callback) {
   $extract_values = FALSE;
-  if (in_array('', $trans_list['keys'], TRUE)) {
+  if (in_array('%top-level-key', $trans_list['keys'], TRUE)) {
     $extract_values = TRUE;
 
-    $trans_list['keys'] = array_diff($trans_list['keys'], array(''));
+    $trans_list['keys'] = array_diff($trans_list['keys'], array('%top-level-key'));
   }
 
   foreach ($yaml as $key => $value) {
diff --git a/yaml_translation_patterns.yml b/yaml_translation_patterns.yml
index 9ad44c8..ed7e914 100644
--- a/yaml_translation_patterns.yml
+++ b/yaml_translation_patterns.yml
@@ -25,6 +25,6 @@
 *.permissions.yml:
   - title
   - description
-  - ''
+  - %top-level-key
 config/schema/*.yml:
   - label