diff --git a/corepos/db/office_op/model.py b/corepos/db/office_op/model.py
index ce43a59..c913ae0 100644
--- a/corepos/db/office_op/model.py
+++ b/corepos/db/office_op/model.py
@@ -108,6 +108,24 @@ class TableSyncRule(Base):
         return "{}: {}".format(self.table_name, self.rule)
 
 
+class UserGroup(Base):
+    """
+    Represents a user/group assignment.
+    """
+    __tablename__ = 'userGroups'
+
+    group_id = sa.Column('gid', sa.Integer(), nullable=False,
+                         primary_key=True, autoincrement=False)
+
+    name = sa.Column(sa.String(length=50), nullable=True)
+
+    username = sa.Column(sa.String(length=50), nullable=False,
+                         primary_key=True)
+
+    def __str__(self):
+        return self.name or ""
+
+
 class User(Base):
     """
     Represents a user within CORE Office.