diff --git a/spec/tags/ruby/library/set/initialize_tags.txt b/spec/tags/ruby/library/set/initialize_tags.txt
new file mode 100644
index 00000000000..4ab5c62bda3
--- /dev/null
+++ b/spec/tags/ruby/library/set/initialize_tags.txt
@@ -0,0 +1,2 @@
+fails:Set#initialize uses #each_entry on the provided Enumerable
+fails:Set#initialize uses #each on the provided Enumerable if it does not respond to #each_entry