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diff --git a/compiler/rustc_error_codes/src/error_codes/E0077.md b/compiler/rustc_error_codes/src/error_codes/E0077.md
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@@ -0,0 +1,23 @@
+A tuple struct's element isn't a machine type when using the `#[simd]`
+attribute.
+
+Erroneous code example:
+
+```compile_fail,E0077
+#![feature(repr_simd)]
+
+#[repr(simd)]
+struct Bad(String); // error!
+```
+
+When using the `#[simd]` attribute on a tuple struct, the elements in the tuple
+must be machine types so SIMD operations can be applied to them.
+
+Fixed example:
+
+```
+#![feature(repr_simd)]
+
+#[repr(simd)]
+struct Good(u32, u32, u32, u32); // ok!
+```