diff --git a/app/controllers/collection_items_controller.rb b/app/controllers/collection_items_controller.rb
index 86a7088076..6c8276ccc5 100644
--- a/app/controllers/collection_items_controller.rb
+++ b/app/controllers/collection_items_controller.rb
@@ -138,6 +138,7 @@ def create
     unless new_collections.empty?
       flash[:notice] = ts("Added to collection(s): %{collections}.",
                             collections: new_collections.collect(&:title).join(", "))
+      flash[:notice] += t("bookmarks.create.warnings.private_bookmark_added_to_collection")
     end
     unless invited_collections.empty?
       invited_collections.each do |needs_user_approval|
diff --git a/spec/controllers/collection_items_controller_spec.rb b/spec/controllers/collection_items_controller_spec.rb
index ec7a4065e5..82d6f23d32 100644
--- a/spec/controllers/collection_items_controller_spec.rb
+++ b/spec/controllers/collection_items_controller_spec.rb
@@ -358,7 +358,7 @@
       context "when the item's creator does not allow collection invitations" do
         it "adds the item anyway" do
           post :create, params: params
-          it_redirects_to_with_notice(work, "Added to collection(s): #{collection.title}.")
+          it_redirects_to_with_notice(work, "Added to collection(s): #{collection.title}. Please note: private bookmarks are not listed in collections.")
           expect(work.reload.collections).to include(collection)
         end
       end
@@ -366,7 +366,7 @@
       context "when the item's creator allows collection invitations" do
         it "adds the item" do
           post :create, params: params
-          it_redirects_to_with_notice(work, "Added to collection(s): #{collection.title}.")
+          it_redirects_to_with_notice(work, "Added to collection(s): #{collection.title}. Please note: private bookmarks are not listed in collections.")
           expect(work.reload.collections).to include(collection)
         end
       end