diff --git a/modules/user/user.install b/modules/user/user.install
index a48feb5..fd460ee 100644
--- a/modules/user/user.install
+++ b/modules/user/user.install
@@ -120,6 +120,10 @@ function user_schema() {
     ),
   );
 
+  // Drupal SQL standards specify using singular table names. The "users" table
+  // is an exception due to the fact that many databases reserve the word
+  // "user." It was also a lot easier to make an exception than to try and
+  // escape it everywhere.
   $schema['users'] = array(
     'description' => 'Stores user data.',
     'fields' => array(