diff --git a/banque.tables.md b/banque.tables.md
index e08d21d..718d95a 100644
--- a/banque.tables.md
+++ b/banque.tables.md
@@ -30,10 +30,10 @@ Création de la table `person`.
 
 ```sql
 create table person (
-  "id" bigint primary key references holder(id),
-  "firstname" text,
-  "lastname" text,
-  "birthdate" date
+  "id" bigint primary key references holder(id) on delete cascade,
+  "firstname" text not null,
+  "lastname" text not null,
+  "birthdate" date not null check (birthdate <= current_date - interval '15 years')
 );
 ```
 
@@ -41,9 +41,10 @@ create table person (
 
 ```sql
 create table company (
-  "id" bigint primary key references holder(id),
-  "name" text,
-  "creation_date" date
+  "id" bigint primary key references holder(id) on delete cascade,
+  "name" text not null,
+  "registration_number" text unique not null,
+  "creation_date" date not null
 );
 ```
 
diff --git a/banque/banque.1.tables.sql b/banque/banque.1.tables.sql
index 4e16341..2944ee0 100644
--- a/banque/banque.1.tables.sql
+++ b/banque/banque.1.tables.sql
@@ -3,12 +3,7 @@ create schema bank;
 set search_path TO bank;
 
 /************************************************************************
- * Holder : table commune à tous les titulaires
- * bigint : entier sur 64 bits
- * primary key : clé primaire, identification unique de l'enregistrement
- * generated always as identity : numéro incrément automatique 1, 2, 3 ...
- * Le type est forcé aux 3 valeurs de l'énumération holder_type
- * current_timestamp date et heure courante. Version moderne de now()
+
  ************************************************************************/
 create type holder_type as enum ('BANK', 'PERSON', 'COMPANY');
 
@@ -52,7 +47,7 @@ create table company (
   "id" bigint primary key references holder(id) on delete cascade,
   "name" text not null,
   "registration_number" text unique not null,
-  "created_at" date not null
+  "creation_date" date not null
 );
 
 /************************************************************************