diff --git a/boards/admin.py b/boards/admin.py
--- a/boards/admin.py
+++ b/boards/admin.py
@@ -124,4 +124,5 @@ class GlobalIdAdmin(admin.ModelAdmin):
     def is_linked(self, obj):
         return Post.objects.filter(global_id=obj).exists()
 
-    list_display = ('__str__', 'is_linked',)
\ No newline at end of file
+    list_display = ('__str__', 'is_linked',)
+    readonly_fields = ('content',)
\ No newline at end of file