diff --git a/db/migrations/001_trainings.up.sql b/db/migrations/001_trainings.up.sql
index 4756fe9..bdac935 100644
--- a/db/migrations/001_trainings.up.sql
+++ b/db/migrations/001_trainings.up.sql
@@ -5,7 +5,7 @@ CREATE SCHEMA IF NOT EXISTS training;
 CREATE TABLE IF NOT EXISTS training.trainings (
   id          SERIAL PRIMARY KEY,
   name        varchar(255) NOT NULL,
-  slug        varchar(255) NOT NULL,
+  slug        varchar(255) UNIQUE NOT NULL,
   description text NOT NULL,
   days        smallint NOT NULL
 );