Referential#lock_table: Add comment about unlock

Refs #5024

1 files changed, 2 insertions, 0 deletions

diff --git a/app/models/referential.rb b/app/models/referential.rb
index f78b4ec9a..9047cc21e 100644
--- a/app/models/referential.rb
+++ b/app/models/referential.rb
@@ -378,6 +378,8 @@ class Referential < ActiveRecord::Base
   private
 
   def lock_table
+    # No explicit unlock is needed as it will be released at the end of the
+    # transaction.
     ActiveRecord::Base.connection.execute(
       'LOCK referentials IN ACCESS EXCLUSIVE MODE'
     )