diff --git a/core/lib/Drupal/Core/Config/TypedConfigManager.php b/core/lib/Drupal/Core/Config/TypedConfigManager.php
index 24b6366..2416947 100644
--- a/core/lib/Drupal/Core/Config/TypedConfigManager.php
+++ b/core/lib/Drupal/Core/Config/TypedConfigManager.php
@@ -151,15 +151,16 @@ public function clearCachedDefinitions() {
   }
 
   /**
-   * Gets fallback metadata name.
+   * Gets fallback configuration schema name.
    *
    * @param string $name
    *   Configuration name or key.
    *
    * @return null|string
-   *   Same name with the last part(s) replaced by the filesystem marker.
-   *   for example, breakpoint.breakpoint.module.toolbar.narrow check for
-   *   definitions in the following order:
+   *   The resolved schema name for the given configuration name or key. Returns
+   *   null if there is no schema name to fallback to. For example,
+   *   breakpoint.breakpoint.module.toolbar.narrow will check for definitions in
+   *   the following order:
    *     breakpoint.breakpoint.module.toolbar.*
    *     breakpoint.breakpoint.module.*.*
    *     breakpoint.breakpoint.module.*
@@ -168,14 +169,12 @@ public function clearCachedDefinitions() {
    *     breakpoint.*.*.*.*
    *     breakpoint.*
    *   Colons are also used, for example,
-   *   block.settings.system_menu_block:footer check will for definitions in the
+   *   block.settings.system_menu_block:footer will check for definitions in the
    *   following order:
    *     block.settings.system_menu_block*
    *     block.settings.*
    *     block.*.*
    *     block.*
-   *
-   *   Returns null, if no matching element.
    */
   protected function getFallbackName($name) {
     // Check for definition of $name with filesystem marker.
diff --git a/core/modules/config/src/Tests/ConfigSchemaTest.php b/core/modules/config/src/Tests/ConfigSchemaTest.php
index 010ea19..5e8f47b 100644
--- a/core/modules/config/src/Tests/ConfigSchemaTest.php
+++ b/core/modules/config/src/Tests/ConfigSchemaTest.php
@@ -398,9 +398,11 @@ function testSchemaFallback() {
   }
 
   /**
-   * Tests use of schema_type_resolver to determine schema..
+   * Tests use of colons in schema type determination.
+   *
+   * @see \Drupal\Core\Config\TypedConfigManager::getFallbackName()
    */
-  function testSchemaTypeResolver() {
+  function testColonsInSchemaTypeDetermination() {
     $tests = \Drupal::service('config.typed')->get('config_schema_test.plugin_types')->get('tests');
     $definition = $tests[0]->getDataDefinition()->toArray();
     $this->assertEqual($definition['type'], 'test.plugin_types.boolean');