diff --git a/core/themes/classy/classy.info.yml b/core/themes/classy/classy.info.yml
index 1afa884..7bb9848 100644
--- a/core/themes/classy/classy.info.yml
+++ b/core/themes/classy/classy.info.yml
@@ -6,6 +6,8 @@ version: VERSION
 core: 8.x
 hidden: true
 
+# @deprecated html5shiv library is scheduled to be removed in 9.0.x. It was
+# added for backwards compatibility with the 8.0 release.
 libraries:
   - core/html5shiv
   - classy/base
diff --git a/core/themes/stable/stable.info.yml b/core/themes/stable/stable.info.yml
index 3476833..28624e9 100644
--- a/core/themes/stable/stable.info.yml
+++ b/core/themes/stable/stable.info.yml
@@ -7,6 +7,11 @@ core: 8.x
 base theme: false
 hidden: true
 
+# @deprecated html5shiv library is scheduled to be removed in 9.0.x. It was
+# added for backwards compatibility with the 8.0 release.
+libraries:
+  - core/html5shiv
+
 libraries-override:
   block/drupal.block.admin:
     css: