diff --git a/data/nodrop-union.toml b/data/nodrop-union.toml
new file mode 100644
index 0000000..17180a7
--- /dev/null
+++ b/data/nodrop-union.toml
@@ -0,0 +1,4 @@
+description = """
+Provided in the standard library as `ManuallyDrop`.
+"""
+url = "https://doc.rust-lang.org/std/mem/struct.ManuallyDrop.html"