diff --git a/couchpotato/model.py b/couchpotato/model.py
index c0b1ee8..1d16614 100644
--- a/couchpotato/model.py
+++ b/couchpotato/model.py
@@ -29,7 +29,10 @@ class Release(Entity):
 
 class File(Entity):
     """File that belongs to a release."""
-    path = Field(UnicodeString(255))
+    history = OneToMany('RenameHistory')
+    path = Field(UnicodeString(255), nullable=False, unique=True)
+    # Subtitles can have multiple parts, too
+    part = Field(Integer)
     release = ManyToOne('Release')
     # Let's remember the size so we know about offline media.
     size = Field(Integer)