diff --git a/sdbs_pile/pile/admin.py b/sdbs_pile/pile/admin.py
index 7d5b3f1..512feb9 100644
--- a/sdbs_pile/pile/admin.py
+++ b/sdbs_pile/pile/admin.py
@@ -1,27 +1,45 @@
 from django.contrib import admin
+from django.db.models import Q
 
 from sdbs_pile.pile.models import Tag, Document
 
 
 class TagAdmin(admin.ModelAdmin):
     exclude = ('is_removed',)
+    list_display = ('name', 'document_count')
 
     @staticmethod
     def document_count(tag: Tag):
         return tag.documents.count()
 
-    list_display = ('name', 'document_count')
+
+class DocumentExternalListFilter(admin.SimpleListFilter):
+    title = 'document location'
+    parameter_name = 'external'
+
+    def lookups(self, request, model_admin):
+        return (
+            (False, 'Local'),
+            (True, 'External'),
+        )
+
+    def queryset(self, request, queryset):
+        if self.value() == "True":
+            return queryset.filter(Q(external_url__isnull=False) & ~Q(external_url__contains="pile.sdbs.cz"))
+        else:
+            return queryset.filter(Q(external_url__isnull=False) | Q(external_url__contains="pile.sdbs.cz"))
 
 
 class DocumentAdmin(admin.ModelAdmin):
     exclude = ('is_removed',)
+    list_filter = ('tags', DocumentExternalListFilter)
+    search_fields = ('title', 'author', 'published')
+    list_display = ('title', 'author', 'published', 'filed_under')
 
     @staticmethod
     def filed_under(document: Document):
         return ", ".join(tag.name for tag in document.tags.all())
 
-    list_display = ('title', 'filed_under')
-
 
 admin.site.register(Tag, TagAdmin)
 admin.site.register(Document, DocumentAdmin)