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diff --git a/compiler/rustc_error_codes/src/error_codes/E0075.md b/compiler/rustc_error_codes/src/error_codes/E0075.md
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+A `#[simd]` attribute was applied to an empty tuple struct.
+
+Erroneous code example:
+
+```compile_fail,E0075
+#![feature(repr_simd)]
+
+#[repr(simd)]
+struct Bad; // error!
+```
+
+The `#[simd]` attribute can only be applied to non empty tuple structs, because
+it doesn't make sense to try to use SIMD operations when there are no values to
+operate on.
+
+Fixed example:
+
+```
+#![feature(repr_simd)]
+
+#[repr(simd)]
+struct Good(u32); // ok!
+```