diff --git a/app/models.py b/app/models.py
index 19c0355..bfdf4a0 100644
--- a/app/models.py
+++ b/app/models.py
@@ -1,6 +1,11 @@
 from flask_login import UserMixin
 from . import db
 
+# many-to-many books/tags
+tags = db.Table('books_tags',
+                db.Column('id_tag', db.Integer, db.ForeignKey('tag.id'), primary_key=True),
+                db.Column('id_book', db.Integer, db.ForeignKey('book.id'), primary_key=True)
+        )
 class User(UserMixin, db.Model):
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
     email = db.Column(db.String(100), unique=True, nullable=False)
@@ -27,6 +32,8 @@ class Book(db.Model):
     editorial = db.relationship('Editorial', backref='books')
     genre = db.relationship('Genre', backref='books')
 
+    book_tags = db.relationship('Tag', secondary=tags, backref=db.backref('books', lazy='dynamic'))
+
 
 class Author(db.Model):
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
@@ -48,12 +55,6 @@ class Genre(db.Model):
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
     name = db.Column(db.String(255), primary_key=True)
 
-# many-to-many books/tags
-tags = db.Table('books_tags',
-                db.Column('id_tag', db.Integer, db.ForeignKey('tag.id'), primary_key=True),
-                db.Column('id_book', db.Integer, db.ForeignKey('book.id'), primary_key=True)
-        )
-
 
 class Quotes(db.Model):
     id = db.Column(db.Integer, primary_key=True, autoincrement=True)
diff --git a/migrations/versions/0fdda1165133_.py b/migrations/versions/0fdda1165133_.py
new file mode 100644
index 0000000..aca75b4
--- /dev/null
+++ b/migrations/versions/0fdda1165133_.py
@@ -0,0 +1,24 @@
+"""empty message
+
+Revision ID: 0fdda1165133
+Revises: a7e98095982b
+Create Date: 2024-04-26 23:25:36.332371
+
+"""
+from alembic import op
+import sqlalchemy as sa
+
+
+# revision identifiers, used by Alembic.
+revision = '0fdda1165133'
+down_revision = 'a7e98095982b'
+branch_labels = None
+depends_on = None
+
+
+def upgrade():
+    pass
+
+
+def downgrade():
+    pass
diff --git a/migrations/versions/__pycache__/0fdda1165133_.cpython-310.pyc b/migrations/versions/__pycache__/0fdda1165133_.cpython-310.pyc
new file mode 100644
index 0000000..190debe
Binary files /dev/null and b/migrations/versions/__pycache__/0fdda1165133_.cpython-310.pyc differ