diff --git a/pyproject.toml b/pyproject.toml
index 1d3cf12..4727d87 100644
--- a/pyproject.toml
+++ b/pyproject.toml
@@ -1,6 +1,6 @@
 [project]
 name = "welearn-database"
-version = "1.5.1"
+version = "1.5.2"
 description = "All stuff related to relationnal database from the WeLearn project"
 authors = [
     {name = "Théo",email = "theo.nardin@cri-paris.org"}
diff --git a/welearn_database/alembic/versions/95ffe7afa64c_add_index_idx_welearn_document_keyword_.py b/welearn_database/alembic/versions/95ffe7afa64c_add_index_idx_welearn_document_keyword_.py
new file mode 100644
index 0000000..51bcf5a
--- /dev/null
+++ b/welearn_database/alembic/versions/95ffe7afa64c_add_index_idx_welearn_document_keyword_.py
@@ -0,0 +1,35 @@
+"""add_index_idx_welearn_document_keyword_document_id
+
+Revision ID: 95ffe7afa64c
+Revises: f5e91a5c950d
+Create Date: 2026-09-16 15:44:06.977345
+
+"""
+
+from typing import Sequence, Union
+
+import sqlalchemy as sa
+from alembic import op
+
+# revision identifiers, used by Alembic.
+revision: str = "95ffe7afa64c"
+down_revision: Union[str, None] = "f5e91a5c950d"
+branch_labels: Union[str, Sequence[str], None] = None
+depends_on: Union[str, Sequence[str], None] = None
+
+
+def upgrade() -> None:
+    op.create_index(
+        "idx_welearn_document_keyword_document_id",
+        "welearn_document_keyword",
+        ["welearn_document_id"],
+        schema="document_related",
+    )
+
+
+def downgrade() -> None:
+    op.drop_index(
+        "idx_welearn_document_keyword_document_id",
+        table_name="document_keyword",
+        schema="document_related",
+    )