diff --git a/pfwb_thesaurus/thesaurus/migrations/0001_initial.py b/pfwb_thesaurus/thesaurus/migrations/0001_initial.py
new file mode 100644
index 0000000..a3a66e1
--- /dev/null
+++ b/pfwb_thesaurus/thesaurus/migrations/0001_initial.py
@@ -0,0 +1,48 @@
+# -*- coding: utf-8 -*-
+from __future__ import unicode_literals
+
+from django.db import models, migrations
+
+
+class Migration(migrations.Migration):
+
+    dependencies = [
+    ]
+
+    operations = [
+        migrations.CreateModel(
+            name='AlternativeTerm',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('term', models.CharField(max_length=300)),
+            ],
+            options={
+                'ordering': ['term'],
+            },
+            bases=(models.Model,),
+        ),
+        migrations.CreateModel(
+            name='Term',
+            fields=[
+                ('id', models.AutoField(verbose_name='ID', serialize=False, auto_created=True, primary_key=True)),
+                ('term', models.CharField(max_length=300)),
+                ('tabellio_id', models.CharField(max_length=10)),
+                ('historical_note', models.TextField(blank=True)),
+                ('scope_note', models.TextField(blank=True)),
+                ('creation_timestamp', models.DateTimeField(auto_now_add=True)),
+                ('last_update_timestamp', models.DateTimeField(auto_now=True)),
+                ('broader', models.ManyToManyField(related_name='narrower', to='thesaurus.Term')),
+                ('related', models.ManyToManyField(related_name='related_rel_+', to='thesaurus.Term')),
+            ],
+            options={
+                'ordering': ['term'],
+            },
+            bases=(models.Model,),
+        ),
+        migrations.AddField(
+            model_name='alternativeterm',
+            name='primary_term',
+            field=models.ForeignKey(to='thesaurus.Term'),
+            preserve_default=True,
+        ),
+    ]
diff --git a/pfwb_thesaurus/thesaurus/models.py b/pfwb_thesaurus/thesaurus/models.py
index 71a8362..25317c9 100644
--- a/pfwb_thesaurus/thesaurus/models.py
+++ b/pfwb_thesaurus/thesaurus/models.py
@@ -1,3 +1,43 @@
+# pfwb_thesaurus - thesaurus system
+# Copyright (C) 2016  Entr'ouvert
+#
+# This program is free software: you can redistribute it and/or modify it
+# under the terms of the GNU Affero General Public License as published
+# by the Free Software Foundation, either version 3 of the License, or
+# (at your option) any later version.
+#
+# This program is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+# GNU Affero General Public License for more details.
+#
+# You should have received a copy of the GNU Affero General Public License
+# along with this program.  If not, see <http://www.gnu.org/licenses/>.
+
 from django.db import models
 
-# Create your models here.
+
+class Term(models.Model):
+    class Meta:
+        ordering = ['term']
+
+    term = models.CharField(max_length=300)
+    tabellio_id = models.CharField(max_length=10)
+
+    broader = models.ManyToManyField('self', symmetrical=False,
+            related_name='narrower')
+    related = models.ManyToManyField('self', symmetrical=True)
+
+    historical_note = models.TextField(blank=True)
+    scope_note = models.TextField(blank=True)
+
+    creation_timestamp = models.DateTimeField(auto_now_add=True)
+    last_update_timestamp = models.DateTimeField(auto_now=True)
+
+
+class AlternativeTerm(models.Model):
+    primary_term = models.ForeignKey(Term)
+    term = models.CharField(max_length=300)
+
+    class Meta:
+        ordering = ['term']