diff --git a/README.md b/README.md
index 43ce86f8d1..12d2bbca80 100644
--- a/README.md
+++ b/README.md
@@ -132,7 +132,7 @@ base de données (tous les départements, et les utilisateurs) avant de commence
 
 On utilise SQLAlchemy avec Alembic et Flask-Migrate.
 
-    flask db migrate -m "ScoDoc 9.0.4" # ajuster le message !
+    flask db migrate -m "ScoDoc 9.0.x: ..." # ajuster le message !
     flask db upgrade
 
 Ne pas oublier de commiter les migrations (`git add migrations` ...).
@@ -142,7 +142,7 @@ Mémo pour développeurs: séquence re-création d'une base:
     dropdb SCODOC_DEV
     tools/create_database.sh SCODOC_DEV # créé base SQL
     flask db upgrade # créé les tables à partir des migrations
-    flask sco-db-init # ajoute au besoin les constantes (todo: mettre en migration 0)
+    flask sco-db-init # ajoute au besoin les constantes (fait en migration 0)
     
     # puis imports:
     flask import-scodoc7-users
diff --git a/app/models/etudiants.py b/app/models/etudiants.py
index cf37a77f4c..57eadbc788 100644
--- a/app/models/etudiants.py
+++ b/app/models/etudiants.py
@@ -138,6 +138,7 @@ class ItemSuivi(db.Model):
 class ItemSuiviTag(db.Model):
     __tablename__ = "itemsuivi_tags"
     id = db.Column(db.Integer, primary_key=True)
+    dept_id = db.Column(db.Integer, db.ForeignKey("departement.id"), index=True)
     tag_id = db.synonym("id")
     title = db.Column(db.Text(), nullable=False, unique=True)
 
diff --git a/app/scodoc/sco_debouche.py b/app/scodoc/sco_debouche.py
index 8def024964..0a301ebf97 100644
--- a/app/scodoc/sco_debouche.py
+++ b/app/scodoc/sco_debouche.py
@@ -335,8 +335,11 @@ def itemsuivi_tag_search(term, REQUEST=None):
         data = []
     else:
         r = ndb.SimpleDictFetch(
-            "SELECT title FROM itemsuivi_tags WHERE title LIKE %(term)s",
-            {"term": term + "%"},
+            "SELECT title FROM itemsuivi_tags WHERE title LIKE %(term)s AND dept_id=%(dept_id)s",
+            {
+                "term": term + "%",
+                "dept_id": g.scodoc_dept_id,
+            },
         )
         data = [x["title"] for x in r]
 
diff --git a/app/scodoc/sco_tag_module.py b/app/scodoc/sco_tag_module.py
index 246c959332..d8a78478fd 100644
--- a/app/scodoc/sco_tag_module.py
+++ b/app/scodoc/sco_tag_module.py
@@ -86,7 +86,10 @@ class ScoTag(object):
             # log("creating new tag: %s" % self.title)
             cnx = ndb.GetDBConnexion()
             self.tag_id = ndb.DBInsertDict(
-                cnx, self.tag_table, {"title": self.title}, commit=True
+                cnx,
+                self.tag_table,
+                {"title": self.title, "dept_id": g.scodoc_dept_id},
+                commit=True,
             )
         if object_id:
             self.tag_object(object_id)
@@ -203,8 +206,11 @@ def module_tag_search(term, REQUEST=None):
         data = []
     else:
         r = ndb.SimpleDictFetch(
-            "SELECT title FROM notes_tags WHERE title LIKE %(term)s",
-            {"term": term + "%"},
+            "SELECT title FROM notes_tags WHERE title LIKE %(term)s AND dept_id=%(dept_id)s",
+            {
+                "term": term + "%",
+                "dept_id": g.scodoc_dept_id,
+            },
         )
         data = [x["title"] for x in r]
 
diff --git a/migrations/versions/d3d92b2d0092_scodoc_9_0_5_ajout_dept_id_sur_.py b/migrations/versions/d3d92b2d0092_scodoc_9_0_5_ajout_dept_id_sur_.py
new file mode 100644
index 0000000000..8ab88cac77
--- /dev/null
+++ b/migrations/versions/d3d92b2d0092_scodoc_9_0_5_ajout_dept_id_sur_.py
@@ -0,0 +1,32 @@
+"""ScoDoc 9.0.5: ajout dept_id sur ItemSuiviTag
+
+Revision ID: d3d92b2d0092
+Revises: 017e32eb4773
+Create Date: 2021-08-29 20:57:55.564519
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = 'd3d92b2d0092'
+down_revision = '017e32eb4773'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.add_column('itemsuivi_tags', sa.Column('dept_id', sa.Integer(), nullable=True))
+    op.create_index(op.f('ix_itemsuivi_tags_dept_id'), 'itemsuivi_tags', ['dept_id'], unique=False)
+    op.create_foreign_key(None, 'itemsuivi_tags', 'departement', ['dept_id'], ['id'])
+    # ### end Alembic commands ###
+
+
+def downgrade():
+    # ### commands auto generated by Alembic - please adjust! ###
+    op.drop_constraint(None, 'itemsuivi_tags', type_='foreignkey')
+    op.drop_index(op.f('ix_itemsuivi_tags_dept_id'), table_name='itemsuivi_tags')
+    op.drop_column('itemsuivi_tags', 'dept_id')
+    # ### end Alembic commands ###
diff --git a/sco_version.py b/sco_version.py
index 7c879eca56..2ac0ac77fc 100644
--- a/sco_version.py
+++ b/sco_version.py
@@ -1,7 +1,7 @@
 # -*- mode: python -*-
 # -*- coding: utf-8 -*-
 
-SCOVERSION = "9.0.4"
+SCOVERSION = "9.0.5"
 
 SCONAME = "ScoDoc"