diff --git a/modules/sql/scheme.sql b/modules/sql/scheme.sql
index a3e4e5c..4712075 100644
--- a/modules/sql/scheme.sql
+++ b/modules/sql/scheme.sql
@@ -29,6 +29,7 @@ CREATE TABLE users (
     user_id         serial              PRIMARY KEY,
     avatar_id       int                 REFERENCES images (image_id),
     passhash        text                NOT NULL,
+    mail            varchar(64)         CHECK ((mail ~ '[a-zA-Z0-9._-]+@[a-zA-Z0-9._-]+\.[a-zA-Z0-9_-]+'),
     nickname        varchar(16)         NOT NULL CHECK (nickname ~ '^[a-zA-Z0-9_-]+$'),
     disp_name       varchar(32),
     user_desc       varchar(512),