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diff --git a/compiler/rustc_error_codes/src/error_codes/E0740.md b/compiler/rustc_error_codes/src/error_codes/E0740.md
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+A `union` was declared with fields with destructors.
+
+Erroneous code example:
+
+```compile_fail,E0740
+union Test {
+    a: A, // error!
+}
+
+#[derive(Debug)]
+struct A(i32);
+
+impl Drop for A {
+    fn drop(&mut self) { println!("A"); }
+}
+```
+
+A `union` cannot have fields with destructors.