diff --git a/core/modules/config_translation/src/FormElement/ElementInterface.php b/core/modules/config_translation/src/FormElement/ElementInterface.php
index 2448daa..7bd4470 100644
--- a/core/modules/config_translation/src/FormElement/ElementInterface.php
+++ b/core/modules/config_translation/src/FormElement/ElementInterface.php
@@ -42,10 +42,12 @@ public function getSourceElement(LanguageInterface $source_language, $source_con
    * case of formatted text, for example, access to the source text format must
    * be checked. If the translator does not have access to the text format, the
    * textarea must be disabled and the translator may not be able to translate
-   * this particular configuration element. If the translator does have access
-   * to the text format, the element must be locked down to that particular text
-   * format; in other words, the format may not be changed by the translator
-   * (because the text format property is not itself translatable).
+   * this particular configuration element, which means that the form value
+   * returned by this particular form element must equal the source value. If
+   * the translator does have access to the text format, the element must be
+   * locked down to that particular text format, which means the format may not
+   * be changed by the translator (because the text format property is not
+   * itself translatable).
    *
    * In addition, the form element is responsible for checking whether the
    * value of such non-translatable properties in the translated configuration