diff --git a/core/modules/block/migrations/d6_block.yml b/core/modules/block/migrations/d6_block.yml
index 9091d534465..5b0f76a88df 100644
--- a/core/modules/block/migrations/d6_block.yml
+++ b/core/modules/block/migrations/d6_block.yml
@@ -1,5 +1,6 @@
 id: d6_block
 label: Blocks
+# This configuration migration depends on the d6_custom_block content migration.
 migration_tags:
   - Drupal 6
   - Configuration
diff --git a/core/modules/block/migrations/d7_block.yml b/core/modules/block/migrations/d7_block.yml
index 154f63528dc..3b301ef0cd1 100644
--- a/core/modules/block/migrations/d7_block.yml
+++ b/core/modules/block/migrations/d7_block.yml
@@ -1,5 +1,6 @@
 id: d7_block
 label: Blocks
+# This configuration migration depends on the d7_custom_block content migration.
 migration_tags:
   - Drupal 7
   - Configuration
diff --git a/core/modules/shortcut/migrations/d7_shortcut_set_users.yml b/core/modules/shortcut/migrations/d7_shortcut_set_users.yml
index 9797c0a26fb..54e9e1281dd 100644
--- a/core/modules/shortcut/migrations/d7_shortcut_set_users.yml
+++ b/core/modules/shortcut/migrations/d7_shortcut_set_users.yml
@@ -1,5 +1,6 @@
 id: d7_shortcut_set_users
 label: Shortcut set user mapping
+# This configuration migration depends on the d7_user content migration.
 migration_tags:
   - Drupal 7
   - Configuration