diff --git a/core/inventory/admin.py b/core/inventory/admin.py
index 2457b5b..24cd14a 100644
--- a/core/inventory/admin.py
+++ b/core/inventory/admin.py
@@ -1,6 +1,6 @@
 from django.contrib import admin
 
-from inventory.models import Item, Container, Event
+from inventory.models import Item, Container, ItemPlacement, Comment, Event
 
 
 class ItemAdmin(admin.ModelAdmin):
@@ -22,3 +22,17 @@ class EventAdmin(admin.ModelAdmin):
 
 
 admin.site.register(Event, EventAdmin)
+
+
+class ItemPlacementAdmin(admin.ModelAdmin):
+    pass
+
+
+admin.site.register(ItemPlacement, ItemPlacementAdmin)
+
+
+class CommentAdmin(admin.ModelAdmin):
+    pass
+
+
+admin.site.register(Comment, CommentAdmin)
diff --git a/core/inventory/models.py b/core/inventory/models.py
index fbbe0a9..10796e1 100644
--- a/core/inventory/models.py
+++ b/core/inventory/models.py
@@ -92,7 +92,7 @@ class Comment(models.Model):
     timestamp = models.DateTimeField(auto_now_add=True)
 
     def __str__(self):
-        return str(self.issue_thread) + ' comment #' + str(self.id)
+        return str(self.item) + ' comment #' + str(self.id)
 
 
 class Event(models.Model):