diff --git a/activerecord/lib/active_record/connection_adapters/postgresql/type_metadata.rb b/activerecord/lib/active_record/connection_adapters/postgresql/type_metadata.rb
index b252a76caa1233de4b6a0e0ca16353f3c40f0143..ffd3be26b087539db61a50cf80bb6ddf98e4a131 100644
--- a/activerecord/lib/active_record/connection_adapters/postgresql/type_metadata.rb
+++ b/activerecord/lib/active_record/connection_adapters/postgresql/type_metadata.rb
@@ -1,6 +1,7 @@
 # frozen_string_literal: true
 
 module ActiveRecord
+  # :stopdoc:
   module ConnectionAdapters
     class PostgreSQLTypeMetadata < DelegateClass(SqlTypeMetadata)
       undef to_yaml if method_defined?(:to_yaml)