diff --git a/polyphonic/library/models.py b/polyphonic/library/models.py
index 595e85a..da04a9b 100644
--- a/polyphonic/library/models.py
+++ b/polyphonic/library/models.py
@@ -438,7 +438,7 @@ class Document(models.Model):
         filename = os.path.basename(str(self.upload))
         inst = auto_tag(filename)
         if inst:
-            self.sections.get_or_create(tag=inst.abbreviate())
+            self.sections.get_or_create(tag=inst.tag)
 
     def delete(self, *args, **kwargs):
         self.upload.delete(save=False)